"Based on Jan Guillou's Crusades trilogy about Swedish Knight Templar Arn Magnusson (Joakim Nätterqvist), this adventure saga follows the son of nobility from his monastic education to his return to the family to help fight for the crown of Sweden. That mission is interrupted, however, when Arn impregnates his lover and is sent to the Holy Land, where as penance he must become a warrior for Christ in the battles of the Crusades."