The story of Siavash has an old mythological theme, and hence one can consider him a mythic-ritual person whose study of various aspects of his story calls for the recognition of ancient rituals. The present research has examined Siavash in ancient texts and Shahnameh with a descriptive-analytical method. Contrary to the views of previous scholars, this paper concludes that Siavash has had the signs of Mitraism within himself. Such signs contain different features than common ones. Incidentally, these signs are those that are not part of Mehr rituals, but are its distinctive features. These signs revolve around the issues of belief in action and wisdom, and those aspects of religion that emphasize the role of intellectuals showed Siavash as the owner of Farah meaning the follower of religion and country, relating to Mehr rituals. So, a number of Siavash’s traits and mythical events around him should be found in beliefs such as believing in theism (Farah bavari), a pass-by-fire test, a horse and a Teshter in ancient mythologies, the source of the alliance, the righteousness, skillfulness in archery and vendetta are beliefs of the worshipers of Mehr
