[1] Following the Persian defeat against the Macedonian king Alexander the Great (r. 336–323 BC) at the Battle of Gaugamela in 331 BC, Nabarzanes conspired against Darius III with other Persian grandees, such as Bessus, the satrap of Bactria, and Barsaentes, the satrap of Arachosia-Drangiana.
Fleeing from the pursuing Macedonian forces, Bessus and the rebels carried Darius III in a covered wagon, reportedly in golden chains.
In order to buy some time for their escape, Bessus and his co-conspirators killed Darius III and left his body by the road.
Nabarzanes then went back to Hyrcania, but was arrested by Phrataphernes, who had him sent to Alexander, where he was seemingly executed.
[6] Seeing as they are in a hopeless position, Mahyar along with Janusipar/Janushyar (Bessus) murders Dara II (Darius III) and then attempt to negotiate with Iskandar (Alexander), eventually meeting up with him.