The combined forces of Pyrrhus, Ptolemy and…

The combined forces of Pyrrhus, Ptolemy and Lysimachus, assisted by the disaffected among his own subjects, had eventually obliged Demterius to leave Macedonia in 288 BCE.

While Demetrius has been engaged in fighting in Macedonia and Asia Minor, his son Antigonus, as his regent, is engaged in maintaining Macedonian hegemony in Greece, which had been achieved in 287 BCE.

Demetrius has passed into Asia and attacked some of the provinces of Lysimachus with varying success, but falls ill in Cilicia as famine and pestilence destroy the greater part of his army, and he solicits Seleucus' support and assistance.

Before he reaches Syria hostilities break out, and after he has gained some advantages over his son-in-law, Demetrius is totally forsaken by his troops on the field of battle and surrendered to Seleucus.

Antigonus offers all his possessions, and even his own person, in order to procure his father's liberty, but all prove unavailing.

Seleucus now claims the Macedonian kingship.