Battle of Ipsus
Ptolemy, the governor of Egypt, Lysimachus, and Seleucus, strong leaders of Alexander's, consolidated their positions after the Battle of Ipsus, in which their common rival Antigonus was defeated. The former empire of Alexander was divided as such: Ptolemy gained territory in southern Anatolia, much of Egypt and the Levant, which combined to form the Ptolemaic Empire; Lysimachus controlled western Anatolia and Thrace, while Seleucus claimed the rest of Anatolia as the Seleucid Empire. Only the kingdom of Pontus under Mithridates I managed to gain their independence in Anatolia due to the fact that Antigonus had been a common enemy.