To shore up her legitimacy with her subjects, Berenice IV married Archelaos (reportedly a descendant of Mithridates VI of Pontus); however, the Romans— especially desperate financiers of Ptolemy XII such as Rabirius Postumus—were determined to restore Ptolemy XII. Pompey persuaded the Roman governor of Syria Aulus Gabinius to invade Egypt and restore Ptolemy XII, offering him 10,000 talents for the mission. Although it put him at odds with Roman law, Gabinius invaded Egypt in the spring of 55 BC by way of Hasmonean Judea; Hyrcanus II had Antipater the Idumaean, the father of Herod the Great, furnish the Roman-led army with supplies. Under Gabinius' command was the young cavalry officer Mark Antony, who distinguished himself by preventing Ptolemy XII from massacring the inhabitants of Pelousion and rescuing the body of Archelaos after the latter was killed in another battle (ensuring him a royal burial). The 14-year-old Cleopatra would have accompanied the Roman expedition into Egypt; years later, Mark Antony said that he had fallen in love with her at this time. Their affair only began 41 BC, when the triumvir Antony summoned Cleopatra to his headquarters at Tarsos to answer for her alleged support of Gaius Cassius Longinus in the Liberators' civil war of 43–42 BC.