born 358, Europus, Macedonia died August/September 281 BC, near Lysimachia, Thrace Macedonian army officer, founder of the Seleucid dynasty. After the death of Alexander the Great, under whom he had served, Seleucus won an empire centred on Syria and Iran. Having been ousted by Antigonus I Monophthalmus and serving Ptolemy, Seleucus reconquered Babylon in 312. He declared himself king in 305. By 303 he had extended his empire to India. In 301 he helped defeat Antigonus at the Battle of Ipsus and received Syria, later taking southern Syria from Ptolemy. A marriage alliance with Demetrius I Poliorcetes's daughter soured, and in 294, when his son became sick with love for Seleucus's wife (the son's stepmother), he gave her to him and made the son coregent. Hoping to reestablish Alexander's empire, Seleucus captured Demetrius (285) and defeated Lysimachus (281), another of Alexander's former generals who had become a satrap in Asia Minor. Later while attempting to enter Macedonia, he was murdered
v. (Latin; "Gloriously Victorious") born 265 died 225 BC Fourth king (r. 246-225) of the Seleucid dynasty. He became ruler when his mother poisoned his father, Antiochus II, and proclaimed him king. Her supporters made away with his Egyptian stepmother, Bernice, daughter of Ptolemy II, whom Antiochus had briefly married. Ptolemy III, Bernice's brother, responded by invading Seleucus's kingdom and taking the eastern provinces. Seleucus managed to regain northern Syria and part of Iran but was defeated by his brother ( 235), now supported by their mother, and ceded territory beyond the Taurus River. He died in a fall from his horse