In Force of Words, Haraldur Hreinsson examines the social and political significance of the Christian religion as the Roman Church was taking hold in medieval Iceland in the 11th, 12th, and 13th centuries. By way of diverse sources, primarily hagiography and sermons but also material sources, the author shows how Christian religious ideas came into play in the often tumultuous political landscape of the time. The study illuminates how the Church, which was gathering strength across entire Europe, established itself through the dissemination of religious vernacular discourse at the northernmost borders of its dominion.