Jason, son of Aeson the deceased heir to the throne of Ioclus, was raised by centaur Chiron after Pelias took the throne. When Jason was old enough to reclaim his kingdom, he came across a river where an old woman begged him to carry her across. In good nature Jason helped her across. The old woman was Hera and from this time, Jason could count on her support.
Pelias pretended to be happy to hand over the throne, but deceived Jason into believing that someone neede to bring the golden fleece back to Iolcus or bad luck would fall upon the kingdom. Jason quickly agreed to get it and sent messengers through all of Greece to get volunteers. Many volunteered even Heracles and Orpheus. The ship, The Argo, had a piece of oak from the trees at Dodona, which had the power of prophecy.
On their travels, the Argonauts come across an elderly king Phineas, a prophet punished by Zeus to be blind and tormented by harpies. After helping him, Phineas tells them about the Clashing Rocks, rocks that crash together, fall apart and repeat. Phineas tells them to use a dove to test the passage. The dove passed through the rocks with only tail feathers clipped by the rocks. The Argonauts go next, but the rocks begin to clash but Athena appears, holds a rock with one hand and pushes the Argo with the other.
King Aietes of Colchis wasn't pleased to see the Argonauts or give up the fleece. He agreed to give the Argonauts the fleece if Jason was able to plough a field using two fire-breathing oxen and to sow the ground with teeth from the dragon killed by Cadmus of Thebes. Every tooth would grow into a warrior whom Jason had to kill them. With Aphrodite's help, Medea, the daughter of Aietes, falls in love with Jason and helps by giving ointment to avoid burns for a day. He then killed the warriors. Aietes promised to hand over the fleece but Medea warned Jason that her father was planning an attack so together they got the fleece and fled. Aietes and his fleet followed them but Medea had taken her brother and slew him and thew pieces of his body into the ocean knowing that Aietes would stop.
The Argonauts returned to Iolcus where they confronted Pelias, but Pelias kept trying to make excuses to put off keeping his promise. Medea's patient wore thin so, in front of Pelias' daughters, she cut up an old ram, threw into a large cauldron with magic herbs where it jumped out as a young lamb. Medea convinced Pelias' daughters to do the same to their father but gave the daughters the wrong herbs. Pelias was killed by his daughters. Blame was put onto Jason and Medea so the people of Iolcus drove them into exile. Jason grew tired of haveing Medea as a wife and wanted to divorce her and marry Glauce, daughter of King Creon of Corinth. In anger, Medea sent Glauce a gift, a robe soaked in poison