#antipapa

• 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.
• Anti-papal — Opposing the Pope of Rome, pontifical authority, or the institution of the Papacy; exhibiting a critical, hostile, or rebellious attitude toward the decrees, dogmas, or political and territorial interests of the Holy See.