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- Following their agreement to work together to defeat Antigonus, Seleucus invades Asia Minor from Babylonia, while Ptolemy attacks Syria and Lysimachus moves into the western part of Asia Minor.
- Docimus, the regent of Phrygia, and Phoenix, the strategos of Lycia, desert Antigonus.
- The Macedonian general, Philetaerus, moves his allegiance from Antigonus to Antigonus' rival, Lysimachus. In return, Lysimachus makes Philetaerus guardian of the fortress of Pergamum with its treasure of some 9,000 talents.