Arn Magnusson is a child of the amazing Folkung tradition in the mid-twelfth century. He experiences childhood in a religious community having a place with the Cistercians. He is prepared in bows and arrows, swordsmanship and horsemanship by a previous Knight Templar, the sibling Guilbert, who dwells in the religious community. Arn is additionally found to be able to use both hands. At some point while meandering the forested areas he experiences three men attempting to constrain a young lady into marriage. At the point when the young lady asks for help two of the men assault , who executes them in self-preservation. In spite of the fact that the priests reveal to Arn he didn’t do anything incorrectly, they question Guilbert preparing him into being a warrior. Guilbert answers that Arn isn’t intended to be a priest however is bound to be a trooper of God. At the point when leaves the cloister and comes back to his family, he is before long maneuvered into the battle between the amazing families, all battling for the crown of Västra Götaland. He helps his companion Knut Eriksson to execute the old ruler Karl Sverkersson.