 Perdiccas chose Cleopatra, which angered Antipater, who allied himself with several other Diadochi, deposed Perdiccas, and was declared regent, only to die within the year.Polyperchon succeeded Antipater in 319 BC as regent, but Antipater's son Cassander established Philip II's son Philip III (Arrhidaeus) as king and forced Polyperchon out of Macedonia.He fled to Epirus, taking Roxana and her son Alexander IV with him, who had previously been left in the care of Olympias.