Ptolemy, the Macedonian ruler of Egypt, invades…

…neighboring Sicyon and …

…Megara.

Rome and Etruria agree in 308 BCE on a thirty-year indutiae (truce).

Pyrrhus, upon becoming ruler of Hellenistic Epirus at the age of twelve, allies himself with Demetrius, son of Antigonus I Monophthalmus of Macedon.

Demetrius, who had been unsuccessful against Ptolemy and against the Nabataeans, liberates Athens from Cassander in 307 BCE, ousting Demetrius of Phaleron, Cassander's governor, and reestablishing the old Athenian constitution.

The grateful Athenians honor Antigonus and Demetrius as divine saviors (theoi soteres).

Cassander's influence in Greece is now broken.

Segesta, whose population is a Helllenized mixed of Elymians and Ionian Greeks, has remained an ally of Carthage.

Besieged by Dionysius of Syracuse in 397 BCE, it is destroyed by Agathocles of Syracuse in 307 BCE, but will recover.

The tyrant Agathocles had returned from his invasion of Africa in 308 to break the Carthaginian blockade of Syracuse; in his absence, the Carthaginians in Africa defeat his remaining forces in 307.

Demetrius defeats Ptolemy's fleet near Salamis on Cyprus in 306, and conquers the island.

Demetrius' victory over Ptolemy gives Antigonus control of the Aegean, of the eastern Mediterranean, and of all of the Near East except Babylonia.

The assembled army proclaims Antigonus king (basileus), and his friends adorn him with the diadem.

For his part, Antigonus appoints Demetrius king and co-regent and sends him the diadem.

This is to become a traditional ceremony in the Hellenistic monarchy.

An exceptional strategist and combat leader, Antigonus is also an astute ruler who cultivates the friendship of Athens and other Greek city-states.

He establishes as his capital city Antigoneia, a little father up on the Orontes than present-day Antakya (Antioch).

Ptolemy temporarily loses Cyrene as well and is unable to hold the important Greek positions of Corinth, …