Antigonus I, called Monophthalmus (“one-eyed”) or Cyclops (382?-301 bc), king of Macedonia (306-301 bc). A general of Alexander the Great, Antigonus secured a large part of Asia Minor after the breakup (323 bc) of Alexander's empire. In the ensuing wars with the other successors, or diadochi, to the empire, he claimed at various times Syria, Persia, and Greece, as well as Macedonia, and, aided by his son Demetrius I, he also attacked Egypt. Antigonus almost realized the ambition of all Hellenistic monarchs to become the sole successor to Alexander's empire, but Lysimachus, king of Thrace, and Seleucus I, king of Babylonia, in alliance with other generals, finally defeated and killed him at the Battle of Ipsus, in Phrygia. Demetrius retained Macedonia and the dependent Greek cities for the Antigonid dynasty.