Coenus was one of the most experienced generals in the army of Alexander the Great beginning his career in 334 BC. He participated in several of Alexander's campaigns. He rose through the ranks until he was given command of a taxis of 1,500 phalangites. In 326 BC, he nearly died at the Battle of the Hydaspes in 326 BC, but after the battle he fell ill and died. He was the son of Polemocrates