Chandragupta Maurya gave 500 elephants to Seleucus as Bakshish. Chandragupta Maurya conquers all of the Macedonian Satrapies in the Indus river valley. In return, Chandragupta gifted 500 war elephants to Seleucus, which helped him get victory against western Hellenistic kings in the Battle of Ipsus in 301BCE