Ptolemy III Euergetes reigned as king of the Ptolemaic kingdom of Egypt from 246 to 222 BC. Under his leadership the dynasty reached the apex of its military reach and cultural prestige, building on foundations laid by his father, Ptolemy II. Ptolemy III combined aggressive foreign intervention with active engagement in Egyptian religion and large-scale cultural patronage, a blend that shaped both the immediate fortunes of the kingdom and the longer term character of Ptolemaic rule. His reign matters because it represents a moment when a Hellenistic monarch successfully presented himself as both a Mediterranean power broker and an Egyptian pharaoh, creating institutional and religious precedents that lasted for generations.