It figures in the tale of the hero Jason and his band of Argonauts , who set out on a quest for the fleece by order of King Pelias , in order to place Jason rightfully on the throne of Iolcus in Thessaly .
It is in the story of Jason and his group of Argonauts . They set out on a quest ordered by King Pelias to get the fleece so that Jason can rightfully claim the throne of Iolcus in Thessaly .