3. The daughter of Lysimachus and Nicaea, was married to Ptolemy II. Philadelphus soon after his accession, B. C. 285. When Arsinoe, the sister of Ptolemy Philadelphus [see No. 2], fled to Egypt in B. C. 279, and Ptolemy became captivated by her, Arsinoe, the daughter of Lysinachus, in conjunction with Amyntas and Chrysippus, a physician of Rhodes, plotted against her ; but her plots were discovered, and she was banished to Coptos, or some city of the Thebais. She had by Ptolemy three children, Ptolemy Evergetes, afterwards king, Lysimachus, and Berenice. (Schol. ad Theocr. Id. 17.128; Paus. 1.7.3; Plb. 15.25.)