(Πλημναῖος), a son of Peratus in Aegialeia, was the father of Orthopolis whom Demeter reared, all the other children of Plemnaeus having died immediately after their birth. He afterwards showed his gratitude by building a temple to her. (Paus. 2.5.5, 11.2)
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890