Guibert of Nogent wrote Gesta Dei per Francos, or The Deeds of God through the Franks, between 1106 and 1109. It was a revision of an earlier anonymous chronicle titled Gesta Francorum. Though his chronicle of the First Crusade was not well known in his own time, Guibert of Nogent is today one of the best known chroniclers of the crusades, perhaps due to his autobiography Monodiae, or Memoirs, which is popularly referred to as A Monk’s Confession. Guibert wrote his memoirs around 1115, which was quickly followed by his treatise against relic cults, On the Relics of Saints, in 1119. In these later works, Guibert accused Jews of using black magic; he was one of the first anti-Semitic writers to do so.