 This honour is held by the Pope's cathedral, the Archbasilica of St. John Lateran which is the mother church of all churches in communion with the Catholic Church.However, St. Peter's is certainly the Pope's principal church in terms of use because most Papal liturgies and ceremonies take place there due to its size, proximity to the Papal residence, and location within the Vatican City proper.The "Chair of Saint Peter", or cathedra, an ancient chair sometimes presumed to have been used by St. Peter himself, but which was a gift from Charles the Bald and used by many popes, symbolizes the continuing line of apostolic succession from St. Peter to the reigning Pope.