The Chair of Saint Peter (Latin: Cathedra Petri), also known as the Throne of Saint Peter, is a relic conserved in Saint Peter's Basilica in Vatican City. The relic is a wooden throne that tradition claims the Apostle Saint Peter, the leader of the Early Christians in Rome and first Pope. The cathedra in Saint Peter's Basilica was once used by the popes and therefore often thought to have been used by Saint Peter himself, but was in fact a gift to Pope John VIII in 875[1].

Ex cathedra is a term referring to infallible proclamations and encyclicals delivered by the pontiff

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  1. Wikipedia: Chair of Saint Peter