This man defeated an enemy of Taxiles at a location now known as the Jhelum [JEY-luhm] River. A conspiracy to kill this man led to the executions of Philotas and Parmenion. His friend Hephaestion died at Ecbatana [ek-BAH-tah-nah], and he regretted murdering Cleitus, who saved his life at the Battle 
This man defeated an enemy of Taxiles at a location now known as the Jhelum [JEY-luhm] River. A conspiracy to kill this man led to the executions of Philotas and Parmenion. His friend Hephaestion died at Ecbatana [ek-BAH-tah-nah], and he regretted murdering Cleitus, who saved his life at the Battle of the Granicus River. This man helped his father at the Battle of Chaeronea [ker-uh-NEE-uh], and his rival successors were known as the Diadochi. This man defeated Darius III at the battles of Gaugamela and Issus [IS-uhs] in the fourth century BC. For 10 points, name this son of Philip II of Macedon who rode the horse Bucephalus, and cut the Gordian knot.
This man defeated an enemy of Taxiles at a location now known as the Jhelum [JEY-luhm] River.
{Alexander} the {Great} [or {Alexander} III; prompt on partial answer]