Ptolemy IX Soter II (Greek: Πτολεμαῖος Σωτήρ, Ptolemaĩos Sōtḗr "Ptolemy the Saviour"), commonly nicknamed Lathyros (Λάθυρος, Láthuros "chickpea"), was twice King of Ptolemaic Egypt. He was 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.