#schism

• Antipope — A person elected illegally or uncanonically to the office of pope of the Roman Catholic Church, in opposition to the officially recognized, legitimate sovereign pontiff. This historical phenomenon usually emerged during periods of religious schism or major political conflicts between the papacy and the empire, when various rival factions disputed supreme spiritual authority.
• Azymite — A term used historically and theologically in the Eastern Christian Church (Orthodox) to designate Western rite Christians (Catholics) who use unleavened bread (matzo / the host) in the celebration of the Holy Eucharist; as an adjective, it describes the worship, ritual, or liturgical elements based on the use of unleavened bread.