In Greek mythology, Agelus (The name derives from agélē (ἀγέλη), meaning "herd," "flock," or "assembly".) was the son of Poseidon and an unnamed nymph of Chios.Pausanias, 7.4.8 He was the brother of Melas and Malina.
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References
Pausanias, Description of Greece with an English Translation by W.H.S. Jones, Litt.D., and H.A. Ormerod, M.A., in 4 Volumes. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1918. . Online version at the Perseus Digital Library Pausanias, Graeciae Descriptio. 3 vols. Leipzig, Teubner. 1903. Greek text available at the Perseus Digital Library.