Who is Jason in Greek mythology

Jason was a Greek Hero

Explanation:

Jason was an ancient Greek mythological hero and leader of the Argonauts, whose quest for the Golden Fleece featured in Greek literature. He was the son of Aeson, the rightful king of Iolcos. He was married to the sorceress Medea.

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solution: read the introduction, the norm, or even explaination if you still dont get it.