Ptolemy I Soter I (Ancient Greek: Πτολεμαῖος Σωτήρ, Ptolemaĩos Sōtḗr, i.e. Ptolemy the Savior), also known as Ptolemy Lagides, c. 367 BC – c. 283 BC, was a Macedonian general under Alexander the Great, who became ruler of Egypt (323–283 BC) and founder of the Ptolemaic Kingdom and dynasty during the course of the War of the Diadochi. In 305/4 BC he demanded the title of pharaoh. He was succeeded by his son Ptolemy II Philadelphus.