Ptolemy IX Lathyros

Ptolemy IX Soter II, commonly nicknamed Lathyros, was twice king of Ptolemaic Egypt. The son of Ptolemy VIII and Cleopatra III; he reigned as Ptolemy Philometor Soter in joint rule with his grandmother Cleopatra II and mother Cleopatra III from 116 to 107 BC, and then again as Ptolemy Soter from 88 to 81 BC. Ptolemy IX became the heir apparent after the murder of his half-brother Ptolemy Memphites in 130 BC, during a civil war between Ptolemy VIII and Cleopatra II. On his father's death in 116 BC, he became co-regent with Cleopatra II and with Cleopatra III. He eventually quarrelled with his m…