(Λέαγρος), son of Glaucon, in conjunction with Sophanes the athlete, of Deceleia, commanded the Athenians who fell in the first attempt to colonise Amphipolis, B. C. 465, at Drabescus or Datus (Hdt. 9.75; Paus. 1.29.4; comp. Thuc. 1.100). His son, a second Glaucon, commanded, with the orator Andocides, the reinforcements sent to the aid of the Corcyraeans, B. C. 432; and his grandson, another Leagrus, is ridiculed in a passage of the comic poet Plato (apud Athen. ii. p. 68c.), as a highborn fool. οὐχ ὁρᾶς ὅτιὁ μὲν Λέαγρος Γλαύκωνος μεγάλου γένουςκόκκυξ ἠλίθιος περιέρχεται.

A sister of his was married to Callias III., son of Hipponicus (Andoc. Myst. p. 126, Bekk.), so that the genealogy stands thus,