On the voyage to Colchis, in addition to other adventures, Jason and his crew of Argonauts became the first humans to pass through the Symplegades (the Clashing Rocks); they also freed Phineus from the curse of the Harpies. When they arrived at Colchis, King Aeetes demanded that Jason accomplish a series of tasks to get the Golden Fleece: he must yoke a team of fierce, fire-breathing oxen and plow a field with them; then he must sow the teeth of a dragon in the field, and deal with the warlike armored men who sprouted from these "seeds"; finally, he must brave the sleepless dragon who guarded the Fleece. Jason accomplished all these tasks with the help of Medea, Aeetes' daughter, who had fallen in love with him. After obtaining the Golden Fleece, Jason and Medea fled from Colchis, pursued by King Aeetes' men.
On their voyage back to Iolcos, they encountered the perils of Scylla and Charybdis and the isle of the Sirens as well as Talos the bronze guardian of Crete. In Iolcos, Medea contrived the murder of King Pelias, after which she and Jason fled to Corinth. In Corinth, after many years of marriage, Jason finally deserted Medea to marry King Creon's daughter; Medea wreaked a terrible vengeance, killing the bride and Creon, and even murdering her own children. She then escaped, leaving Jason to mourn his losses. Jason was killed years later when he was struck on the head by a timber from the Argo.