At the division of the provinces (the so-called Partition of Babylon) after Alexander's death in 323 BC, Antigonus had his authority over Phrygia, Lycaonia, Pamphylia, Lycia and western Pisidia confirmed by Perdiccas, the regent of the empire. However, he incurred the enmity of Perdiccas by refusing to assist Eumenes to obtain possession of the provinces allotted to him: Paphlagonia and Cappadocia. Leonnatus had left with his army for Greece, leaving Antigonus alone to deal with Cappadocia, a task he apparently could not or would not complete without additional aid. Perdiccas seems to have viewed this as a direct affront to his authority, and led the royal army to conquer the area. From there, Perdiccas turned west towards Phrygia in order to humble Antigonus, who escaped with his son Demetrius to Greece, where he obtained the favour of Antipater, the viceroy of Macedonia (321 BC), and Craterus, one of Alexander’s top generals. During the First War of the Diadochi, he formed a coalition with Antipater, Craterus and Ptolemy. In 320 BC, Antigonus sailed to and secured Cyprus. The war ended in 320 BC, when Perdiccas was murdered by discontented officers (Seleucus and Antigenes) while unsuccessfully trying to invade Ptolemy's satrapy of Egypt.
- public domain: Chisholm Hugh, ed. (1911)։ «Antigonus Cyclops»։ Encyclopædia Britannica 2 (11th ed.)։ Cambridge University Press։ էջ 125 One or more of the preceding sentences incorporates text from a publication now in the
- Arrian, Ta Met’ Alex. 1,30; Richard A. Billows, Antigonos the One-Eyed and the Creation of the Hellenistic State, p. 66.
- Arrian, History of the Diadochi, 1,28; Diodorus Siculus, Bibliotheca Historica, XVIII 33,1-36,5; Cornelius Nepos, Parallel Lives, Eumenes 5,1.