401 BCE
The army of Cyrus the Younger defeats that of Artaxerxes II at the Battle of Cunaxa at Babylon. However, Cyrus the Younger is killed. Orontas participates as the satrap of Armenia.
386 BCE
Orontas is made a commander with Tiribazos against Evagoras I in Cyprus.
362 BCE
Orontas takes a leadership role in the Great Satraps Revolt. He then switches his allegiance to Artaxerxes II. He uses Pergamon as his base.
354 BCE
Orontas revolts again and takes Pergamon. He eventually reconciles with Artaxerxes III and ends the revolt.
344 BCE
Death of Orontas.