Year 318 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Flaccinator and Venno (or, less frequently, year 436 Ab urbe condita). The denomination 318 BC for this year has been used since the early medieval period, when the Anno Dominicalendar era became the prevalent method in Europe for naming years.
Antigonus resolves to become lord of all Asia, and in conjunction with Cassander and Ptolemy. He enters into negotiations with Eumenes; but Eumenes remains faithful to the royal house. He raises an army and forms a coalition with the satraps of the eastern provinces. He then captures Babylon from Antigonus.
Antigonus marches against Eumenes, so Eumenes withdraws east to join the satraps of the provinces beyond the Tigris River.
In a power struggle in Athens after the death of Antipater, Phocion is deposed as the ruler of Athens, convicted of treason, and executed by those Athenians hoping to restore democracy to the city. Shortly afterward, the Athenians decree a public burial and a statue in his honor.