So he could keep track of what he was doing
It was Pelias, whose throne Jason wanted.
Jason was instructed by his brother Pelias to find and bring back the Golden Fleece from Colchis. Pelias believed that this task was nearly impossible and hoped that Jason would fail, as he saw Jason as a threat to his own power.
Jason, knowing that he was the rightful king, told Pelias that and Pelias said, "To take my throne, which you shall, you must go on a quest to find the Golden Fleece." Jason happily accepted the quest.
Getting him back home
According to ancient Greek mythology Aeson was the rightful king of Iolcos, but his half-brother Pelias usurped the throne. It was Pelias who sent Aeson's son Jason and his Argonauts to look for the Golden Fleece.
Pelias
The uncle of Jason was Pelias.
It was Pelias, whose throne Jason wanted.
When Jason and Medea returned to Lolcus, they found out that Pelias had killed Jason's father and his mother had died later on due to mourning. - Morgahn Mulholland
Jason was instructed by his brother Pelias to find and bring back the Golden Fleece from Colchis. Pelias believed that this task was nearly impossible and hoped that Jason would fail, as he saw Jason as a threat to his own power.
obtain the golden fleece
King Pelias and Jason died
CMS Runnymede
Jason, knowing that he was the rightful king, told Pelias that and Pelias said, "To take my throne, which you shall, you must go on a quest to find the Golden Fleece." Jason happily accepted the quest.
pelias sent jason and his crew on a suicide mission to get rid of jason
Getting him back home
According to ancient Greek mythology Aeson was the rightful king of Iolcos, but his half-brother Pelias usurped the throne. It was Pelias who sent Aeson's son Jason and his Argonauts to look for the Golden Fleece.