Pope Saint Nicholas I (; c. 800 – 13 November 867), also called Saint Nicholas the Great, was Pope from 24 April 858 to his death in 867. He is remembered as a consolidator of papal authority and power, exerting decisive influence upon the historical development of the papacy and its position among the Christian nations of Western Europe. Nicholas I asserted that the pope should have suzerain authority over all Christians, even royalty, in matters of faith and morals.