Polyidus was a sage in Greek myth who resided in ancient Lycia. Among other things, he provided information that helped Bellerophon find and tame the Pegasus. He was later asked by King Minos of Crete to find the king's lost son Glaucus. Polyidus did so, but found the child dead, and refused to bring the child back to life when Minos asked him to do so. However, Glaucus was revived by a miraculous herb revealed by a snake, and Minos imprisoned Polyidus on Crete until he taught Glaucus all he knew. Polyidus did so, but had Glaucus spit in his mouth at the last minute before leaving, taking back all the knowledge.