After likely arranging for her brothers Ptolemy XIII and Ptolemy XIV - to whom she was married, according to custom - to be killed, Cleopatra gained sole rule of Egypt. She later left for Rome with Julius Caesar but returned to Egypt after his assassination, luring(誘惑する)Caesar's heir, Mark Antony, into marriage. Octavian, whose sister Antony had previously married, declared war on Cleopatra and Antony and defeated their joint forces at the Battle of Actium.