king of Macedon after Alexander the Great, was the son of Antipater. He made several conquests in Greece, abolished democracy at Athens, and gave the government of that state to the orator Demetrius. Olympias, the mother of Alexander, having caused Aridaus and his wife Eurydice, with others of Cassander's party, to be put to death, he besieged Pydna, whither the queen had retired, took it by stratagem, and caused her to be put to death. He married Thessalonica, the sister of Alexander the Great; and killed Roxana and Alexander, the wife and son of that conqueror. At length he entered into an alliance with Seleucus and Lydiachus, against Antigonus and Demetrius; over whom he obtained a great victory near Iplius in Phrygia, 301 years before the Christian era, and died three years after, in the 10th year of his reign.