In Greek mythology, Leucopeus (The name is a compound derived from two distinct ancient Greek roots — Λευκός (Leukós), meaning "white", "bright", or "clear" and Ὤψ (Ops, genitive ōpós), meaning "face", "eye", or "countenance".) was a Calydonian prince as the son of King Porthaon and Euryte. He was the brother of Oeneus (successor of their father as king of Calydon), Agrius, Alcathous, Melas, and Sterope.Apollodorus, 1.7.10
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References
Pseudo-Apollodorus, The Library with an English Translation by Sir James George Frazer, F.B.A., F.R.S. in 2 Volumes, Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1921. Online version at the Perseus Digital Library. Greek text available from the same website.