Dissension and rivalry soon afflicted the Macedonians, however. The satrapies handed out by Perdiccas at the Partition of Babylon became power bases each general used to bid for power. After the assassination of Perdiccas in 321 BC, Macedonian unity collapsed, and 40 years of war between "The Successors" ("Diadochi") ensued before the Hellenistic world settled into four stable power blocs: Ptolemaic Egypt, Seleucid Mesopotamia and Central Asia, Attalid Anatolia, and Antigonid Macedon. In the process, both Alexander IV and Philip III were murdered.