Passage: Starting from 301 BC Armenia is included within the sphere of influence of the Seleucid Empire, but it maintained a considerable degree of autonomy, retaining its native rulers. According to Polyaenus, in 227 BC the Seleucid rebel king Antiochus Hierax took refuge in Armenian territory governed by King Arsames, founder of the city Arsamosata. Towards the end of 212 BC the country was divided into two kingdoms, both vassal states of the Seleucids: Greater Armenia and Armenia Sophene, including Commagene or Armenia Minor. Antiochus III the Great decided to suppress the local dynasties, and besieged Arsamosata. Xerxes, the satrap of Sophene and Commagene, surrendered and implored the clemency of the king, whom he accepted as his sovereign. Antiochus gave his sister Antiochis as a wife to Xerxes; she would later murder him. Greater Armenia was ruled by an Orontid descendant of Hydarnes, the last Orontid ruler of Greater Armenia (Strabo xi.14.15); he was apparently subdued by Antiochus III the Great, who then divided the land between his generals Artaxias (Artashes) and Zariadres (Zareh), both of whom would claim descent from the Orontid family.

Question: Who did Antiochus give to Xerxes?
his sister Antiochis