Lysimachus
4. Son of Ptolemy Philadelphus by Arsinoe, the daughter of Lysimachus, king of Thrace. He survived both his brother Ptolemy III. Euergetes, and his nephew, Ptolemy IV. Philopator; but was put to death by Sosibius, the minister and guardian of Ptolemy Epiphanes. (Schol. ad Theocr. Idyll. 17.128; Plb. 15.25.)
From William Smith (ed.), Dictionary of Greek and Roman Biography and Mythology. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.