Antipope
WordNet
noun
(1) Someone who is elected pope in opposition to another person who is held to be canonically elected
"The antipopes resided in Avignon during the Great Schism"
WiktionaryText
Etymology
From , plus , from and , diminutive form of .
Noun
- A person who claims or claimed to be the pope as the result of a disputed election, but is not considered by the Roman Catholic Church to be the real pope.