"(Ἀργαῖος; Argaîos). Son of Ptolemaeus I (and of Eurydice?); murdered by Ptolemaeus II (because of a conspiracy?) after 282 BC. PP 6, 14489."
https://referenceworks.brillonline.com/entries/brill-s-new-pauly/argaeus-e134140?s.num=0&s.f.s2_parent=s.f.book.brill-s-new-pauly&s.q=Ptolemy