

When Jason and Medea returned, Pelias still refused to give up his throne. However, it is unknown but possible that the two were both killed directly by Pelias. Death of Pelias ĭuring Jason's absence, Pelias thought the Argo had sunk, and this was what he told Aeson and Promachus, who committed suicide by drinking poison. Jason, Medea, and the Argonauts fled Colchis and began their journey home to Thessaly along with Medea's brother Absyrtus. She cast a spell to put the dragon to sleep, enabling Jason to obtain the Golden Fleece from the oak tree. Medea, daughter of Aeëtes, fell in love with Jason, and being endowed with magical powers, aided him in his completion of the difficult task. Aeëtes demanded that Jason must first yoke a pair of fire-breathing bulls to a plough and sow dragon's teeth into the earth. Upon their arrival, Jason requested the Golden Fleece from the king of Colchis, Aeëtes. These heroes who would join his quest were known as the Argonauts. Jason made preparations by commanding the shipwright Argus to build a ship large enough for fifty men, which he would eventually call the Argo. Though the Golden Fleece simply hung on an oak tree, this was a seemingly impossible task, as an ever-watchful dragon guarded it. It would be found at Colchis, in a grove sacred to Ares, the god of war. Pelias took Jason's advice and sent him to retrieve the Golden Fleece. Jason responded that he would send that man after the Golden Fleece. Fearful, Pelias asked Jason what he would do if confronted with the man who would be his downfall.

When Jason entered Iolcus, he was announced as a man wearing one sandal. The Murder of Pelias by His Daughters, Georges Moreau de Tours (1878) In Virgil's Aeneid and Hyginus' Fabulae (13), Hera/ Juno disguised herself as an old woman, whom Jason helped across the river when he lost his sandal. 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. Many years later, Pelias offered a sacrifice by the sea in honor of Poseidon. Jason grew in the care of Chiron the centaur, on the slopes of Mount Pelion, to be educated while Pelias, fearing that he would be overthrown, was warned by an oracle to beware a man wearing one sandal. Aeson sent Jason away from Iolcus in fear that Pelias would have him killed as a potential heir to the throne. While in the dungeons, Aeson married and had several children, most famously, Jason. To this end, he banished Neleus and Pherês, and locked Aeson in the dungeons in Iolcus (by the modern city of Volos). Pelias was power-hungry and he wished to gain dominion over all of Thessaly. When they reached adulthood, Pelias and Neleus found Tyro and killed her stepmother Sidero for having mistreated her (Sidero hid in a temple dedicated to Hera but Pelias killed her anyway, causing Hera's undying hatred of Pelias). 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. One day, Poseidon, filled with lust for Tyro, disguised himself as Enipeus and lay with her from their union were born twin sons, Pelias and Neleus. She pursued Enipeus, who refused her advances. Tyro was married to King Cretheus of Iolcus, with whom she had three sons, Aeson, Pherês, and Amythaon, but she loved Enipeus, a river god. These daughters are sometimes called collectively as Peliades after their father.

He was the father of Acastus, Pisidice, Alcestis, Pelopia, Hippothoe, Amphinome, Evadne, Asteropeia, Antinoe and Medusa. His wife is recorded as either Anaxibia, daughter of Bias, or Phylomache, daughter of Amphion.
