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Demetrius, also in 306, crushed Ptolemy in a naval battle and secured Cyprus and the Aegean, though he failed in a famous siege of Rhodes (305–304).Antigonus and Demetrius now proclaimed themselves joint kings in succession to Alexander.Cassander, who was a statesman, had founded two great cities, Cassandreia and Thessalonica, as well as rebuilding Thebes.His death in 297 was a prelude to more disturbances.
For a time Antipater was hard-pressed in Lamía (the war of 323–322 is known as the Lamian War).
In 311 the four leaders agreed to divide the world, leaving Ptolemy with Egypt and Cyprus, Antigonus with Asia, Lysimachus with Thrace, and Cassander with Macedonia and Greece, but only until Alexander IV came of age in 305. Royal blood, however, was quickly forgotten in the pursuit of power.
Cassander murdered Rhoxane and young Alexander in 310, soon after Antigonus had vainly tried to crush Seleucus.
Then, in 319, Antipater died and was succeeded by a senior commander but maladroit politician named Polyperchon, who tried to win the Greeks of the mainland by a new proclamation of their liberties.
The result was that the Athenians used their freedom to execute the pro-Macedonians, including the worthy but compromising Phocion. Eumenes, allied with Polyperchon, challenged Antigonus and secured Babylon, but he was betrayed and killed in 316. Polyperchon’s position was weak, and he was soon ousted by the able, up-and-coming Cassander.
Leonnatus intervened, nominally in support but in fact ambitious to usurp Antipater’s power; he was killed in action, however.