A Cyclopaedia of Female Biography/Arsinoe I
ARSINOE I,
Daughter of Ptolemy the First, son of Lagus, king of Egypt, and of Berenice, was married to Lysimachus, king of Thrace. Lysimachus fell in battle in Asia, and his kingdom of Macedonia was taken possession of by Seleucus. Seven months afterwards, Seleucus was assassinated by Ptolemy Ceraunus, elder brother of Ptolemy Philadelphus, who also put to death the two children of his half-sister Arsinoe, after he had inveigled her into a marriage with him. Their mother he then banished to the island of Samothracia, where she remained till she was summoned to Egypt to become the second wife of her brother, Ptolemy the Second, Philadelphus, king of that country, who reigned from B. C. 284 to 276. Arsinoe is said to have founded a city, called by her own name, on the banks of the Achelaus, in Ætolia.