Arsinoe (in Greek Aρσινoη; lived 4th century BC) was the mother of Ptolemy I Soter (323–-283 BC), king of Egypt, was originally a concubine of Philip II, king of Macedon, and it is said she was given by Philip to Lagus a Macedonian, while she was pregnant with Ptolemy. Hence, if we can believe our sources, Ptolemy was regarded by the Macedonians as the son of Philip.¹

References

• Smith, William (editor); Dictionary of Greek and Roman Biography and Mythology, "Arsinoe (1)", Boston, (1867)
  

Note

• 1 Pausanias, Description of Greece, i. 6; Curtius Rufus, Historiae Alexandri Magni, ix. 8; Suda, s.v. "Lagos"
  

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This article incorporates text from the public domain Dictionary of Greek and Roman Biography and Mythology by William Smith (1867).