Too common a name for us to be certain which holder of it has generated the entry (also, according to Adler, in the Ambrosian Lexicon: 913). Perhaps Polyidus of Selymbria, the poet of the 'new dithyramb'; see RE 21.1659-61 'Polyidos'[9]. (The Suda does contain the names of most of the major poets of the 'new dithyramb': delta 1029.). But other possibilities include two Corinthian seers of that name. The elder (OCD(4) s.v. Polyeidus(1)) first located and then revived Glaucus, son of Minos, after he had fallen into a honey-jar: Hyginus, Apollodorus, et al. (It is he, presumably, who was the subject of lost plays, bearing his name, by Sophocles, Euripides and Aristophanes.) His younger homonym and descendant died at Troy: Homer, Iliad 13.663-672.