Canon Law – A collection of church rules or laws drawn up and imposed by ecclesiastical authority to cover all matters of faith, morals, and discipline.
Canonical Hours – The seven periods of the day set aside for prayer and worship. They are Matins, usually combined with Lauds, Prime, Tierce, Sext, Nones, Vespers, and Compline.
Canterbury – A city in SE England, the base for the Christinization of the island during the early A.D. 600s, and the seat of the Archbishop of all England; now headquarters for the Anglican communion.
Carthage – The ecclesiastical metropolis of Roman N. Africa, located in modern Tunisia, second only to Rome in importance, and the location for many historic Church Councils between A.D. 220 and 650.
Casuistry – The attempt to apply clear but broad Biblical doctrines to more complex specific individual cases.
Cathari – From the Greek, meaning “the pure ones,” an ascetic sect of medieval times, and one of the original targets of both the Crusades and the Inquisition. Their heretical beliefs included dualism, universalism, docetism, and gnosticism; also ritual suicide, rejection of infant baptism, and purgatory.