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plural antipopes
(Christianity) A person who claims or claimed to be the pope, usually as the result of a disputed election or deposition, but is not considered by the Roman Catholic Church to be the real pope. quotations examples
Meanwhile support for the ‘puppet’ antipope Nicholas V, deprived of his protector and by now excommunicated along with his emperor, rapidly withered away.
2007, Edwin Mullins, The Popes of Avignon, Blue Bridge, published 2008, page 59