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His successor imprisoned him to prevent any antipope instillations, and he later died in jail.

At one point John joined an untimely “crusade,” sailing to Flanders to fight the forces of the French antipope.

Other splits have led to the rise of antipopes - other men who claim to be the pope and refuse to bow to Rome.

In the 14th century, clashes between Catholic Church leaders resulted in the election at one point of competing antipopes in France and Italy.

The oldest item in the show is a 12th-century parchment papal bull, signed by the reigning pope, Anastasius IV; three future popes; one future antipope; and one future saint.