In Greek mythology, Agenor son of Phegeus is a Psophian prince who, with his brother Pronous, kills Alcmaeon over the necklace and peplos of Harmonia and is afterward slain by Alcmaeon's sons Amphoterus and Acarnan. He is kept distinct from Agenor of Tyre, Agenor of Troy, and the many other mythic Agenors.
Adapted from Wikipedia, "Agenor (son of Phegeus)" · CC BY-SA 4.0
I.Family
Agenor is the son of Phegeus, king of Psophis in Arcadia, and brother of Pronous and of Arsinoe (also called Alphesiboea), who was married to the Argive Alcmaeon and later abandoned by him.
Pausanias, telling the same Psophian tragedy, names Phegeus' children Temenus, Axion, and Alphesiboea — a rival onomastic set that the atlas keeps as a source variant rather than a separate node.
II.The necklace and Alcmaeon's death
When Alcmaeon wished to give the celebrated necklace and peplos of Harmonia — formerly Arsinoe's — to his second wife Callirrhoe, daughter of Achelous, Agenor and Pronous slew him at Phegeus' instigation.
The brothers then went to Delphi intending to dedicate the necklace and peplos; there Amphoterus and Acarnan, sons of Alcmaeon and Callirrhoe, killed them in turn.
III.Homonym care
The atlas id agenor-psophis is the Psophian son of Phegeus alone. Distinct from agenor (Tyrian father of Europa and Cadmus), agenor-trojan, agenor-argive, agenor-aetolian, and the Odyssean suitor stubs agenor-ithaca and agenor-zacynthus.