He is best known as the author of one of the controversial treatises against the Greeks, called forth by the encyclical letters of Photius. His comprehensive Liber adversus Græcos[1] deals with the procession of the Holy Spirit, the marriage of the clergy, fasting, the consignatio infantium, the clerical tonsure, the Roman primacy, and the elevation of deacons to the see of Rome. He declares that the accusations brought by the Greeks against the Latins are “superfluous questions having more relation to secular matters than to spiritual.”
The work is mainly a collection of quotations or “sentences,” from Greek and Latin Church Fathers, the former translated.
