antipope [Lat.,=against the pope], person elected pope whose election was declared uncanonical and in opposition to a canonically chosen pontiff. Important antipopes were Novatian ; Clement III (see Guibert of Ravenna ); Nicholas V (see Rainalducci, Pietro ); Clement VII (see Robert of Geneva ); Benedict XIII (see Luna, Pedro de ); John XXIII (or by a different count, John XXII; see Cossa, Baldassare ); and Felix V (see Amadeus VIII ), who was the last antipope.

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