The plot of the movie loosely follows the first two volumes of the trilogy. Arn Magnusson is part of the powerful Folkung dynasty in the mid 12th century. He grows up in a monastery belonging to the Cistercians. He is trained in archery, swordsmanship and horsemanship by a former Knight Templar who resides in the monastery. When Arn leaves the monastery and returns to his famil...