Ptolemy Keraunos
On the assassination of his father in 281 BC, the task of holding together the empire was a formidable one. A revolt in Syria broke out almost immediately. Antiochus was soon compelled to make peace with his father's murderer, Ptolemy Keraunos, apparently abandoning Macedonia and Thrace. In Anatolia he was unable to reduce Bithynia or the Persian dynasties that ruled in Cappadocia.