<P> Pelias was the son of Tyro and Poseidon . His wife is recorded as either Anaxibia, daughter of Bias, or Phylomache, daughter of Amphion . He was the father of Acastus, Pisidice, Alcestis, Pelopia, Hippothoe, Amphinome, Evadne, Asteropeia, and Antinoe . </P> <P> Tyro was married to Cretheus, with whom she had three sons, Aeson, Pherês, and Amythaon, but she loved Enipeus, a river god . She pursued Enipeus, who refused her advances . One day, Poseidon, filled with lust for Tyro, disguised himself as Enipeus and from their union were born Pelias and Neleus, twin boys . Tyro exposed her sons on a mountain to die, but they were found by a herdsman who raised them as his own, as one story goes, or they were raised by a maid . When they reached adulthood, Pelias and Neleus found Tyro and killed her stepmother Sidero, for having mistreated her . (Sidero hid in a temple to Hera but Pelias killed her anyway, causing Hera's undying hatred of Pelias .) Pelias was power - hungry and he wished to gain dominion over all of Thessaly . To this end, he banished Neleus and Pherês, and locked Aeson in the dungeons in Iolcus (by the modern city of Volos). While in the dungeons, Aeson married and had several children, most famously, Jason . Aeson sent Jason away from Iolcus in fear that Pelias would kill him as an heir to the throne . Jason grew in the care of Chiron the centaur, on Mount Pelium, to be educated while Pelias, fearing that he would be overthrown, was warned by an oracle to beware a man wearing one sandal . </P> <P> Many years later, Pelias offered a sacrifice by the sea in honor of Poseidon . Jason, who was summoned with many others to take part in the sacrifice, lost one of his sandals in the flooded river Anaurus while rushing to Iolcus . In Virgil's Aeneid, Hera had disguised herself as an old woman, whom Jason was helping across the river when he lost his sandal . When Jason entered Iolcus, he was announced as a man wearing one sandal . Fearful, Pelias asked Jason what he would do if confronted with the man who would be his downfall . Jason responded that he would send that man after the Golden Fleece . Pelias took Jason's advice and sent him to retrieve the Golden Fleece . It would be found at Colchis, in a grove sacred to Ares, the god of war . Though the Golden Fleece simply hung on an oak tree, this was a seemingly impossible task, as an ever - watchful dragon guarded it . </P> <P> Jason made preparations by commanding the shipwright Argus to build a ship large enough for fifty men, which he would eventually call the Argo . These heroes who would join his quest were known as the Argonauts . Upon their arrival Jason requested the Golden Fleece from the King of Colchis, Aeëtes . Aeëtes demanded that Jason must first yoke a pair of fire - breathing bulls to a plough and sow dragon's teeth into the earth . Medea, daughter of Aeëtes, fell in love with Jason, and being endowed with magical powers, aided him in his completion of the difficult task . She cast a spell to put the dragon to sleep, enabling Jason to obtain the Golden Fleece from the oak tree . Jason, Medea, and the Argonauts fled Colchis and began their return journey to Thessaly . </P>

Who fulfilled the warning beware of the man with one sandal