Archbasilica of Saint John Lateran is the cathedral for the Diocese of Rome and the pope is its bishop. By tradition, every cathedral has a cathedra which is the bishop’s throne or chair. It is normally located in the apse behind the altar. This dome crowns the pope’s cathedra at San Giovanni in Laterano. The chair was used frequently when the archbasilica was the pope’s residence until the 14th century. Today, it is rarely used. Instead, the pontiff has the Chair of Saint Peter at St. Peter’s Basilica in Vatican City.