 Lysimachus dominated until 281 BC, when he was defeated by the Seleucids at the Battle of Corupedium.In 280/279 BC the Milesians adopted a new chronological system based on the Seleucids.In 279 BC the city was taken from Seleucid king Antiochus II by Egyptian king Ptolemy II Philadelphus, who donated a large area of land to cement their friendship, and it remained under Egyptian sway until the end of the century.