Answer: antipope

AnswerCrossword Clue
ANTIPOPEHippolytus or Novatian, e.g.
ANTIPOPEFigure in a schism
ANTIPOPENot a fan of "The Rape of the Lock"?
ANTIPOPEAlexander V, e.g.
antipopea pope who opposes the properly elected pope
antipopeone elected or claiming to be pope in opposition to the pope canonically chosen