King Porus
Arrian states, with Onesicritus as his source, that Bucephalus died at the age of thirty. Other sources, however, give as the cause of death not old age or weariness, but fatal injuries at the Battle of the Hydaspes (June 326 BC), in which Alexander's army defeated King Porus. Alexander promptly founded a city, Bucephala, in honour of his horse. It lay on the west bank of the Hydaspes river (modern-day Jhelum in Pakistan). The modern-day town of Jalalpur Sharif, outside Jhelum, is said to be where Bucephalus is buried.