Page "Antiochus III the Great" Paragraph 10

Having thus recovered the central part of Asia Minor ( for the Seleucid government had perforce to tolerate the dynasties in Pergamon, Bithynia and Cappadocia ) Antiochus turned to recovering the outlying provinces of the north and east.

He obliged Xerxes of Armenia to acknowledge his supremacy in 212 BC.

In 209 BC Antiochus invaded Parthia, occupied the capital Hecatompylus and pushed forward into Hyrcania.

The Parthian king Arsaces II apparently successfully sued for peace.