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The Chair of Saint Peter (Latin: Cathedra Petri) is a relic conserved in St. Peter's Basilica, enclosed in a sculpted gilt bronze casing that was designed by Gian Lorenzo Bernini and executed between 1647 and 1653. The name derives from the Latin cathedra meaning chair or throne, which is used to denote the chair or seat of a bishop. The cathedra in St. Peter's Basilica was once used by the popes. Inside the Chair is a wooden throne, which, according to tradition, was used by Saint Peter. It was, however, actually a gift from Charles the Bald to Pope John VIII in 875.

This has been a much-used name for the pope's authority.
However, I am glad to have given your a chuckle for the day. NEVER hurts to laugh.