Jason is a character in Greek mythology who goes on an expedition with 50 heroes with the name Argonauts. Their mission is to bring back a golden fleece from the King Aeetes of Colchis and to get back his lost throne.  The ship of the Argonauts is named Argo. King Aeetes of Colchis tells  Jason and the Argonauts  to complete a set of very difficult tasks with dragons, mermaids and fire-breathing bulls. He accomplishes all the tasks and takes the throne back.