Career
During the reign of Lysimachus he was his governor in Asia Minor. Sosthenes was elected King by the Macedonian army, but he may or not have reigned as king. Appointed as strategos he may have declined the title of king as he had no royal connections.
He defeated Bolgius, one of the earliest invading Galatian leaders but was soon faced with the invasion of Brennus in the summer of 279 British Columbia. Antigonus II Gonatas tried to invade Macedonia from Asia in 278 but was beaten by Sosthenes.
