Ptolemy VIII Euergetes II Tryphon (Greek: Πτολεμαῖος Εὐεργέτης Τρύφων, Ptolemaĩos Euergétēs Tryphōn, "Ptolemy the Benefactor, the Opulent"; c. 184 BC – 28 June 116 BC), nicknamed Physcon (Φύσκων, Physkōn, "Fatty"), was a king of the Ptolemaic kingdom . He was the younger son of King Ptolemy V and Queen Cleopatra I. His reign was characterised by fierce political and military conflict with his older siblings, Ptolemy VI and Cleopatra II.
Ptolemy VIII was originally made co-ruler with his siblings in the run-up to the Sixth Syrian War, in 170 BC. In the course of that war, Ptolemy VI was captured and Ptolemy VIII arguably became sole king of Egypt. When the war ended and Ptolemy VI was restored to the throne in 168 BC, the two brothers continued to quarrel. In 164 BC Ptolemy VIII drove out his brother and became sole king of the Ptolemaic empire, but he was expelled in turn in 163 BC. As a result of Roman intervention, Ptolemy VIII was awarded control of Cyrene. From there he repeatedly tried to capture Cyprus, which had also been promised to him by the Romans, from his brother.