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1996 Volume 3
University College Dublin, Ireland
Slavery in the Roman Empire
Numbers and Origins
John Madden
University College
Though slavery was a prevailing feature of all Mediterranean countries in antiquity, the
Romans had more slaves and depended more on them than any other people.
It is impossible, however, to put an accurate figure on the number of slaves owned by the
Romans at any given period: for the early Empire with which we are concerned
conditions varied from time to time and from place to place. Yet, some estimates for
Rome, Italy, and the Empire are worth attempting. The largest numbers were of course in
Italy and especially in the capital itself. In Rome there were great numbers in the imperial
household and in the civil service - the normal staff on the aqueducts alone numbered 700
(Frontin. Aq. 116-7). Certain rich private individuals too had large numbers - as much for
ostentation as for work (Sen. Ep.110.17). Pedanius Secundus, City Prefect in AD 61, kept
400 slaves (Tac. Ann. 14.43.4), Gaius Caecilius Isidorus, freedman of Gaius Caecilius,
left 4116 in his will in 8 BC, while some owners had so many that a nomenclator had to
be used to identify them (Pliny HN 33.135; 33.26). However, there is evidence to suggest
that these cases were not typical - even for great houses. Sepulchral inscriptions for the
rich noble gens the Statilii list a total of approximately 428 slaves and freedpersons from
40 BC to AD 65. When these figures are analysed, the number of slaves and freedpersons
definitely owned by individual members of the gens is small, e.g. Statilius Taurus
Sisenna (consul of AD 16) and his son had six, Statilius Taurus Corvinus (consul
ordinarius of AD 45) had eight, and Statilia Messalina, wife of Nero, four or five.
Seneca, a man of extraordinary wealth, believed he was travelling frugally when he had
with him one cartload of slaves (most likely four or five) (Ep 87.2). References in
Juvenal and the Scriptores Historiae Augustae suggest that many non-plebeian Romans
had either no slave or merely one or two (Sat. 3.286; 9.64-67,142-7; S.H.A. Hadr.17.6).
From evidence such as this Westermann, Hopkins and others are understandably cautious
when attempting to come to a total figure for slaves in the city of Rome in the 1st century
AD. Hopkins' estimate of 300,000-350,000 out of a population of about 900,000-950,000
at the time of Augustus seems plausible.
The same kind of caution needs to be exercised in attempting to arrive at a figure for
slaves in Italy for the same period. Passages in the Satyricon (e.g. 37;47;53) would
suggest that some households had vast numbers. But that work is of course fiction -
though the references to slave numbers there can only have point if certain private
individuals did own a lot of slaves. Overall, a figure of around two million slaves out of a
population of about six million at the time of Augustus would perhaps seem right (again
we follow Hopkins). If so, approximately one in every three persons in Rome and Italy
was a slave.
And what of the Empire as a whole for this period? It is impossible to give any kind of
accurate figure. We have neither statistics for the total area nor for the provinces
separately. And of course the number of slaves in each province depended on the
particular circumstances prevailing there. Some provincial locations had a high number
of slaves: Pergamum in the 2nd century AD (we deduce this from Galen De Propr. Anim.
9) had 40,000 adult slaves and these formed (as at Rome) one third of the adult
population. At Oea (Tripoli) in Africa also in the 2nd century AD the wife of Apuleius
owned a familia of slaves well in excess of four hundred (Apol. 77.93; cf.102). However,
other areas in the Empire had comparatively few slaves. The evidence from papyri
suggests that in all likelihood slaves in Egypt never rose much above 10% of the
population and in poorer areas there dropped to as low as 2%. And in other regions,
particularly perhaps in the more backward provinces of the West, slaves may never have
comprised a significant segment of the work force at all. What then might we assume as
an approximate number of slaves in the entire empire in this period? The attractive
hypothesis of Harris is ten million, i.e. 16.6%-20% of the estimated entire population of
the Empire in the first century AD, i.e. one in every five or six persons would have been a
slave. This of course is not a computation, merely a conjecture.
Whence came these slaves? Some have presupposed that because two of the more
important sources of slaves in the Republic - war and piracy - had become significantly
restricted in the Empire there was a gradual diminution in the number of slaves during the
first three centuries AD. However, there is no statistical proof of this, and for that reason
Harris rejects it (rightly I believe), preferring to think that there was no serious drop in
the number of slaves or in the demand for them - at least until AD 150. And since there is
no evidence either that the cost of slaves spiralled upwards during this period, it seems
sensible to infer that the supply of slaves needed annually to replenish the normal
depletion of their numbers was more or less available without too much difficulty.
This raises two obvious but interesting questions:
1. What number of new slaves was needed from year to year?
2. Where did these replacements come from?
To answer the first of these questions we need to know the average length of time the
slave spent as slave. This however, depends in turn on the average life expectancy of a
slave. It has been estimated by Keith Hopkins that for the entire population the average
life expectancy at birth was 20-30 years. Combining this figure with evidence from
Roman tombstones Harris in turn estimates that the average life expectancy of a slave at
birth in the Empire was unlikely to be more than 20 years. This seems reasonable, and
since the average length of a slave's time as slave would be shorter than his average life
expectancy at birth - partly because some slaves were manumitted and partly because
some were not initially slaves but made so subsequently -it follows, if the number of
slaves was to remain more or less constant as we have assumed, that the need for new
slaves was exceptionally great. On these hypotheses Harris suggests that more than half a
million were required annually for the first century and a half of the Empire.
Where did these slaves come from? The jurist gives a general answer: servi aut
nascuntur, aut fiunt ['slaves are either born or made'] (Inst. 1.3). During the Republican
period one of the principal sources (if not the principal source) of slaves had been
prisoners of war. However, with the establishment of the principate under Augustus and
the extension of the pax Romana across the Empire the significance of this source
decreased. Yet, not completely of course: wars still continued but on a smaller scale. And
there were even some major influxes of slaves from this source. The number of Jews
enslaved as a result of the crushing of the Jewish rebellion by Vespasian and Titus (AD
66-70) was put (reliably, it would seem) at 97,000 by Josephus (B.J. 6.9.3). The steady
expansion in Britain continued to supply British slaves onto the market. Great numbers of
prisoners of war reached Rome from the Dacian wars of Trajan (John Lydus' half-amillion, [De Mag. 2.28] is, however, an exaggeration). And after the Jewish revolt led by
Bar-Cochba in AD 132-35 a large amount of Jews - well over 100,000, it is estimated were sold as slaves in the East (Chronicon Paschale 1.474).
Roman soldiers involved in frontier wars and rebellions would have had many chances to
buy prisoners of war as slaves at disposal auctions. Although this is not mentioned in the
contemporary literature, it can be deduced from papyri which reveal slaves in the
ownership of soldiers and veterans in Egypt. However, when Hadrian decided on a
border plan of continuous defence along natural or man-made boundaries, these
opportunities must have become far fewer. The effect on slave numbers of these various
military episodes though significant was yet more short than long term. Harris, for
example, thinks it improbable that in an average year for the period AD 14-150 more
than 2%-3% (i.e. 10,000-15,000) of the slave requirement was supplied from prisoners of
Accordingly, we must turn our attention to the other sources of slaves in the early
centuries of the Empire. Some (e.g. Barrow, Boese) have taken the view that, since the
slave body at this period was already very great, the bulk of new slaves required each
year would have been provided from their own class, i.e. that the slave body would have
been almost self-propagating. Vernae (i.e. slaves born at home and kept within the
familia - in Roman law any infant born to a slave woman was in turn a slave [cf. Gaius,
Inst. 1.82]) - are certainly mentioned frequently in our sources. They were normally
preferred by the Romans, who tended to get on well with them: their background was
known, they spoke Latin from the beginning, they were accustomed to slavery knowing
no other life, and they could be taught whatever skill their master intended for them. In
particular, we have indications that they were encouraged to marry and have children (cf.
Columella, Rust. 1.8.19 and earlier Varro, Rust. 1.17.5,7; 2.126), and in fact for our
period the slave's type of marriage - contubernium - is well documented. Surely then, the
argument goes, the number of new slaves needed annually would come for the most part
from reproduction among the slaves themselves?
However, on closer analysis, this reasoning is flawed. True, some of the more fortunate
city slaves and certain rural ones as well enjoyed a secure home life. And undoubtedly
these together with the many female slaves who had children by their masters (or other
free men) will have contributed considerably to the number of new slaves entering the
system each year. Nevertheless, the belief that the total slave-body was more or less selfpropagating is unsound. There are a number of reasons for this.
One is the likelihood that the slave-body was disproportionately male. There is of course
no clear statistical confirmation of this. However, if we allow for differences from one
area to another and exclude entirely perhaps Roman Egypt (Biezunska-Malowist [1977],
p.21, claims that male slaves were not more numerous than females there) the overall
picture from the accessible evidence seems consistent.
1. First of all it is clear that males were in the majority where work was difficult and
weighty - in building, in mining, in numerous types of industry, in a wide variety of
services such as loading and unloading at docks, portage, transportation, etc. In
agriculture also male slaves would have been more in demand. Small landowners would
have to be content with whatever slaves were available irrespective of their sex, while
large landowners would undoubtedly have needed some female slaves e.g. for weaving,
cloth making, cooking. However, it is clear from passages in Varro and Columella, where
the question of which of the more reliable agricultural slaves should be allowed a female
companion is treated, that permission for such a partner was a special concession. Varro
recommended that praefecti ['overseers'], as an incentive to their faithfulness, should be
granted female slaves with whom they could have children, while lesser slaves should
have to do with less (Rust. 1.17.5,7). In Columella, on the other hand, it is the vilicus
['steward'] who should be given a female partner (Rust. 1.8.4). In the ergastula - the
private prisons belonging to many Roman farms where slaves were forced to work in
fetters - the inmates would have been very largely male. It is evident from this that
among agricultural slaves males surely outnumbered females.
When we turn to domestic staff the evidence suggests that there too male slaves were
more numerous. S. Treggiari in her analysis of the 79 members of the city household staff
of Livia has noted that 77% were male (the percentage was similar among freedpersons
and slaves). This is a very revealing figure since we would expect a domina to have a
higher number of female staff than a dominus. And in her study of the city familiae of the
Statilii and the Volusii Treggiari has shown that about 66% of the freedpersons and
slaves were male, while of the thirty child slaves whose names were inscribed on the
tombs of these two families 80% at a minimum were male. P.R.C. Weaver in his
examination of the burial places of the imperial household stationed in Carthage
calculated that 76% were males. One of the Oxyrhynchus papyri provides evidence of a
big urban slave familia in Roman Egypt. It belonged to the wealthy Titus Julius Theon in
Alexandria (died AD 111) and of fifty-nine slaves (at least) recorded as belonging to it a
mere two were female.
In literature also there are occasional indications that it was more usual for private
individuals to have male rather than female slaves : e.g. Horace, Sat. 1.6.116, has his
meal served "by three servant boys" (pueris tribus); Naevolus in Juvenal, Sat. 9.64-7,
owns "one servant boy" (puer unicus) and will have to get a second; in Lucian, Merc.
Cond. (=On Salaried Posts in Great Houses) 32 both the cook and lady's hairdresser
seem to be male; in the Cena of the Satyricon male slaves appear to be almost
everywhere, c.f. e.g.. 27;28; 31;34. It would seem safe to conclude that in general,
whenever slaves were bought, males outnumbered females, and that this was the pattern
also for the total slave body of the Empire. Incidentally, there are, as Harris points out,
parallels for this from the later Atlantic slave trade. For the period 1791-1798 there were
230 male slaves brought to Cuba compared to 100 female. And for Jamaica for the same
period the ratio was 183 males to 100 females.
A second reason for the slave body's inability to propagate itself is linked to
manumission. There is some evidence to suggest that female slaves were manumitted
more often than males and marriageable females (it would seem) most often of all. The
principal reason for this is thought to be marriage. Since the children of such a marriage
were usually free, the emancipation of these nubile slaves would have removed the very
individuals who were essential for the continuation of the class.
Another reason for thinking that the slave population did not reproduce itself in sufficient
numbers is that female slaves, on the available evidence (limited admittedly), do not
seem to have been very prolific. Columella e.g. who refers to favours (such as a break
from work) which he has granted to feminae fecundiores ['more fertile women'], includes
mothers of three in this category. The implication is that in Italy the greater proportion of
slave mothers gave birth to and reared at most two children. For the provinces
unfortunately there is little reliable information. Even in Egypt the picture is obscure: the
papyri do not seem to have been properly analysed with this question in mind. However,
three or more children would appear to have been well above average for a slave woman
there. P.Mich. V.326 mentions one slave mother of five children, but that is quite
unusual. This apparently low fertility rate for Egypt is significant. There slaves brought in
from abroad must have cost comparatively more than in the majority of other places
across the empire. We would accordingly have expected even greater encouragement to
procreation among slaves in Egypt than elsewhere.
Another reason for doubting that the slave body was likely to reproduce itself is that even
free peoples at certain periods found it hard to do so. Polybius e.g. discusses the decline
of the population of Greece in his own day (mid 2nd century BC) and attributes this to
two factors, childlessness and the scarcity of men (36.17.5-11). Much of southern Italy
also experienced a decrease in its numbers towards the end of the Republic. Indeed, it is
remarkable - given the prevalence of child-exposure, the limitations of obstetrics, diet and
medicine, and the effects of wars, famines and the like - how buoyant the numbers of free
peoples in general remained.
The evidence from slave populations elsewhere in history perhaps deserves mention here.
In general this favours the argument that slave populations do not normally reproduce
themselves. In the United States the reverse was true (there slave numbers increased after
importation was banned in 1808), but that was a special case. For example, Brazil and the
Caribbean imported more African slaves than North America, yet the slave body in both
areas experienced a natural decline in numbers - up to 5% per annum depending on time
and place. Why the United States was different is not clear, but a plausible suggestion is
that the working and environmental conditions affecting the lives of slaves were more
favourable there than elsewhere. It is unlikely that comparable conditions were to be
found in the Roman Empire, and so we would expect the trend there to resemble that
which prevailed later outside the U.S.A.
If these arguments are correct, vernae on their own will have failed by a significant
amount to meet the annual requirements for new slaves. This shortfall, Harris, taking
everything into account, estimated at several hundred thousand per year.
How was this shortfall made good? Where did the required number of new slaves
originate? We must turn again to those who were made slaves. As well as prisoners of
war there were other groups who belonged to this category. First, there were those who
were kidnapped and sold into slavery. Both Augustus and Tiberius took measures against
kidnapping (Suet. Aug. 32.1; Tib. 8.2; Columella Rust. 1.6.3). Augustus put a curb on
grassatores ['bandits'] who used to capture travellers (both free and slave) and hand them
over to landowners for retention in ergastula. However, in spite of the efforts of the two
emperors kidnapping was not eradicated and persisted down to the next century (cf. e.g.
Apul. Met. 7.9; Philostr. V.A. 8.7.12). Yet, it would not have been so frequent and
widespread that it could be considered a major source of new slaves in the early empire.
The same can be said of piracy. This practice was considerably restricted when Pompey
crushed the pirates after the passing of the Lex Gabinia in 67 BC and later when the
moves against the piratical Illyrians came to a successful conclusion at the battle of
Actium in 31 BC Thereafter, the major section of the Mediterranean was rendered safe
for journeying and commerce for the following two centuries by the creation and
continued upkeep of the imperial fleet. However, some instances of piracy still occurred
in the Mediterranean, cf. e.g. Lucian De Merc. Cond. 24. Outside the Mediterranean,
where the auxiliary imperial squadrons were less active, pirates would have had more
opportunities, cf. e.g. Strabo 11.496 for the Heniochi in the Black Sea. Nevertheless, it is
improbable that piracy could ever have contributed a sizeable fraction of the slave
numbers needed in the early centuries of the empire.
Another source of slaves was purchase from over the boundaries of the empire.
Presumably this happened at all major limites, but its extent is impossible to determine.
M. Crawford (JRS [1977],117-124) has made an attractive case for a series of such
purchases in the late Republic. He argues that hoards of Republican denarii found in
Dacia in the lower Danube basin are best explained as payments from c. 65 to 30 BC (i.e.
after a hitherto significant source - piracy - had been suppressed by Pompey in 67 BC) by
slave dealers/merchants to the local aristocracy. These latter (Crawford suggests) in
exchange for sought-after commodities of the Mediterranean world such as silver and
wine, sold off "perhaps [their] own humble dependants and certainly the humble
dependants of others captured in internal raiding"(p.121).
For the Empire Tacitus gives an instance for the lower Rhine in the reign of Domitian
(Agr. 28.5). Evidence for the practice can also be extrapolated from the Periplous Maris
Erythraei (13,31,36), Strabo (11.493) and two tariff inscriptions, one from Palmyra (AD
137) (CIS II.3.1.3913), the other from Numidia (AD 202) (CIL VIII 4508). Yet, it is
remarkable that when the place of origin of slaves is indicated in Roman literature, this is
almost invariably from within rather than from without the Empire. And the papyri and
inscriptions suggest the same pattern. Thus it is unlikely that slaves bought from beyond
the frontiers would have been plentiful enough to meet a significant portion of the total
slave needs of the early Empire.
What of the other sources of slaves? The sale of their own offspring by parents was one
of these. This occurred particularly in hard times when parents attempted to ease their
burden. The evidence for it, whether in literature or inscriptions, is sparse, yet we can
presume that it did take place during the first centuries of the empire. However, the
practice is unlikely to have been widespread. Philostratus says that it was a custom for the
Phrygians "even to sell their children"(V.A. 8.7.12) - the inference being that this was
rather exceptional. Tacitus (Ann. 4.72) tells how the Frisians in Lower Germany on being
subjected to an excessive tribute by the Romans were forced eventually to sell their wives
and children into slavery. This too however, would have been unusual. In general it is
unlikely that even the most impoverished parents, once they had initially resolved to
bring up a baby, would sell that baby into servitude - unless there was some very special
A few other methods of enslavement should also be mentioned here. The first was selfsale. Hermeros, for example (if we can take Petronius seriously in the Satyricon 57.4),
rather than remain a tribute-paying provincial and hoping subsequently to become a
Roman citizen (i.e. tribute-free), seems to have sold himself into slavery. A second
method was for debt. Here a debtor who was unable to pay could be "given up" (addictus
) to his creditor. A third method was penal enslavement i.e. slavery arising from
conviction in law. Punishment for grave crimes could entail the removal of personal
rights - the guilty being usually condemned to work as slaves in quarries or mines or as
gladiators. However, it seems unlikely that any one of these methods, or indeed all three
together, could have provided a significant number of slaves for our period. In fact, in the
case of self-sale, its legality was never formally acknowledged in Roman law.
We can now pause here and take stock. Of all the sources so far discussed vernae were
the most important. But even they, it has been suggested, left on average an annual deficit
of several hundred thousand slaves. Since none of the other sources mentioned made
significant dents in this number, we must ask "From where then did the main bulk of the
remainder come?" Evidence points to "foundlings" - a source which, we may surmise,
supplied considerably more slaves for our period than had been usually thought.
The abandonment of infants was widespread over much of the Roman world, and, no
doubt, occurred even more frequently whenever circumstances became especially
difficult. The custom was not made illegal until AD 374. Abandoned children usually
either died or were made slaves, but the percentage in each group is beyond recall. In the
case of the latter the owners themselves sometimes found the infants (either by accident
of design); at other times they received them from finders who knew of their need. But
there are also signs in the papyri of the availability of infants on request i.e. that
individuals who were part of the slave trade nexus either collected abandoned babies for
later sale themselves or bought them from others who found them. Sometimes owners
engaged nurses under contract (a number of the relevant documents survive among the
papyri) to look after foundlings in their early months. Occasionally foundlings were
recovered by their parents. At other times if they could provide proof of their original
citizen status and obtain a champion - an assertor - they could themselves initiate legal
Evidence for the practice of child-exposure in Rome and across the Empire is
considerable. In his Roman Antiquities 2.15 Dionysius of Halicarnassus refers to a law of
Romulus which obligated the Romans to raise all infant boys and the first-born infant
girl, and prohibited the killing of any child under the age of three unless it was maimed or
abnormal from birth. The likelihood is that this was not a real law but an invention in the
late Republic in response to the worrying level of child-abandonment at the time (v. P.A.
Brunt, Italian Manpower, 149). Tacitus considered it deserving of comment (Germ. 19;
Hist. 5.5) that the Germans and the Jews held it wrong to kill an unwanted child - the
implication being that the Romans thought otherwise. Even the Roman aristocracy
exposed children. Dio Cassius (54.16) says that there were far more males than females
among the nobility in Rome (in 18 BC), a ratio that can best be explained (given the
number of males killed in the civil wars) by the abandonment of females at birth. This
hypothesis receives support in Pliny, Pan. 26.5-27, where it is clear that not only did the
poor need incentives to bring up their children but the rich did as well. Augustus would
not allow the child born to Julia the Younger to be acknowledged and reared (Suet. Aug.
Elsewhere in many areas of the Roman world, we find child exposure widespread. It is
securely documented for Roman Egypt, where two graphic phrases from the papyri
deserve mention. The first is the legal description of the practice: " to rescue from the
dung-pile for enslavement" (e.g. B.G.U. 4.1107.9; 5.41); the second, the infamous advice
of a husband in a letter to his wife in 1 BC :"If you do give birth, if it is male, let it live, if
it is female, cast it out" (Select Papyri [Loeb] 1 no.105,8-10). (Needless to say, not all
Egyptian-Greek couples thought like the husband here: infant boys too were abandoned
Child-exposure was practised in Asia Minor, on the Greek mainland and on the Aegean
islands. In Bithynia-Pontus for example in AD 111 during the governorship of Pliny the
Younger the problem of the status and maintenance costs of enslaved foundlings became
so serious that Pliny felt compelled to write to Trajan himself about the matter - and
received from the emperor a letter in reply (Ep. 10.65-66). Pliny's letter also reveals that
similar kinds of problems had long caused concern in Achaea, for it refers to an edict of
Augustus, and to letters of Vespasian, Titus and Domitian dealing with these matters
there. Aelian, V.H. 2.7, thought it noteworthy that the citizens of Thebes attempted to put
a stop to child-exposure. Plutarch, De amore prolis 5 (Mor. 497e), stated bluntly: "poor
people do not rear their children". Christian apologetic writers too (even though there
may be exaggeration in their censure ) indicate that the practice remained widespread: cf.
e.g. Tertullian, Apol. 9.7, "you (i.e. pagans) in more cruel fashion stifle your children's
breath in water, or expose them to cold and hunger and dogs"; see also idem , Ad Nat.
1.15; Minucius Felix, Oct. 30.2; Justin Martyr, Apol. 1.27.
Granted all of this, how important are we to rate foundlings as a slave source? Here we
may recapitulate and conclude. When Tiberius and his successors followed in general
Augustus' advice of confining the empire within its present frontiers (Tac. Ann. 1.11.7),
one of the principal sources of slaves i.e. prisoners of war, seriously decreased. However,
as far as we are aware, no major emergency in the replenishment of slave numbers
occurred. The reason surely is that the considerable range of other slave sources already
available were together able to make up sufficiently for the shortfall. Yet, of these
sources, only two, vernae and foundlings, could, we are convinced, have been major
contributors. Vernae certainly were important, yet, if the arguments and estimates given
above are sound, vernae would have fallen well short of supplying the full yearly
requirement. That leaves foundlings. Since we know that child exposure was a
widespread phenomenon - urban as well as rural - over a considerable section of the
Greek world, Asia Minor, Egypt, Italy and elsewhere in the West, we may conclude that
enslaved foundlings were more or less able to make up for the shortage in the slave
supply caused by the drop in the numbers of prisoners of war in the first century and a
half of the empire - a shortage which vernae and the other sources could not offset.
Additional Bibliography
Biezunska-Malowist, I. "Die Expositio von Kindern als Quelle der Sklavenbeschaffung
im griechisch-romischen Aegypten". Jahrbuch für Wirtschaftsgeschichte 2 (1971) 12933.
__________________ L'esclavage dans l'Egypte gréco-romaine. Seconde
partie:période romaine. Warsaw,1977.
Boese, W. E. A Study of the Slave Trade and the Sources of Slaves in the Roman Republic
and the Early Roman Empire . University of Washington: Dissertation, 1973 [obtainable
in book form from University Microfilms, Ann Arbor, Michigan].
Bradley, K.R. "On the Roman Slave Supply and Slavebreeding". In M.I.Finlay, ed.
Classical Slavery . London, 1987. [This article emphasizes the "high probability"
ofvernae as an important source throughout Rome's central period (i.e. c.200 BCc.AD200), but argues against regarding "warfare under the Republic and breeding under
the Empire as the two respective principal sources of supply," preferring rather "a
combination of complementary sources, warfare, trade and breeding, each of which was a
constant contributor but of fluctuating relative significance according to developments in
the wider historical world"(pp.58-9).]
__________ Slavery and Society at Rome . Cambridge,1994.
Crawford, M. "Republican Denarii in Romania: the Suppression of Piracy and the SlaveTrade". JRS 67 (1977), 117-24.
Harris, W.V. "Child-Exposure in the Roman Empire". JHS 84 (1994), 1-22.
Treggiari, S. "jobs in the Household of Livia". Proceedings of the British School in Rome
43 (1975), 48-77.
__________"Family Life among the Staff of the Volusii". TAPA 105 (1975), 393-401
Weaver, P.R.C. Familia Caesaris. Cambridge,1972.
Wiedemann,T.E.J. Slavery . Greece and Rome : New Surveys in the Classics No. 19.
This paper is a version of part of a lecture given at the Annual Summer School of the
Classical Association of Ireland in Galway, August 1994. In its preparation I have drawn
freely on the following works : Barrow, R.H. Slavery in the Roman Empire .
London,1928 ; Hopkins, K. Conquerers and Slaves. Sociological Studies in Roman
History, Volume 1. Cambridge,1978; Westermann, W.L. The Slave Systems of Greek and
Roman Antiquity. Philadelphia,1955 and in particular Harris, W.V. 'Towards a Study of
the Roman Slave Trade', Memoirs of the American Academy in Rome XXXVI (1980),
117-40. I am grateful to an anonymous reader of Classics Ireland for some helpful
comments and suggestions.