Indian campaign of Alexander the Great
The Indian campaign of Alexander the Great began in 326 BC. After conquering the Achaemenid Empire of Persia, the Macedonian king (and now high king of the Persian Empire) Alexander launched a campaign into the northwestern Indian subcontinent. The Battle of the Hydaspes river against King Porus in Punjab is considered by many historians, Peter Connolly being one of them, as the most costly battle that the armies of Alexander fought. The rationale for this campaign is usually said to be Alexander's desire to conquer the entire known world, which the Greeks thought ended in India. While considering the conquests of Carthage and Rome, Alexander died in Babylon on June 13, 323 BC. In 321 BC, two years after Alexander's death, Chandragupta Maurya of Magadha, founded the Maurya Empire in modern-day India.