Arsinoe II was first married to King Lysimachus of Thrace, to Arsinoe II Dynasty Ptolemaic Dynasty Titles Queen Relatives Burial Place whom she bore three sons. After his death in battle in 281 BC, she fled to Cassandrea and married her half-brother Ptolemy Keraunos. This proved to be a serious misjudgement, as Ptolemy Keraunus promptly killed two of her sons; the third was able to escape. Arsinoe fled again, this time to Alexandria, Egypt.