Lysimachus līsĭm´əkəs [key], c.355–281 BC, Thessalian general of Alexander the Great. He was a commander in Alexander's fleet on the Hydaspes as well as his bodyguard. On Alexander's death (323 BC) Lysimachus took control of Thrace. He joined (314 BC) the other Diadochi— Cassander , Ptolemy I , and Seleucus I —in the league against Antigonus I , and after the defeat of Antigonus at Ipsus, Lysimachus took W Asia Minor as his share (301 BC). In 286 BC he added Macedonia to his kingdom by defeating Pyrrhus. Five years later Lysimachus was defeated in a war with Seleucus and was killed in battle at Corupedium near Magnesia ad Sipylum. A legend says that Lysimachus' wife, Arsinoë (daughter of Ptolemy I), persuaded him to kill his son by a former marriage and that the son's widow took refuge with Seleucus and provoked the final war.

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