The Metropolitan Cathedral of Saint Sebastian, better known as the Metropolitan Cathedral of Rio de Janeiro or as the Cathedral of St. Sebastian of Rio de Janeiro, is a cathedral of the Catholic Church and the seat of the Archdiocese of São Sebastião. The cathedral is home to the cathedra of the Archbishops of the city of Rio de Janeiro, Brazil. The …The Metropolitan Cathedral of Saint Sebastian, better known as the Metropolitan Cathedral of Rio de Janeiro or as the Cathedral of St. Sebastian of Rio de Janeiro, is a cathedral of the Catholic Church and the seat of the Archdiocese of São Sebastião. The cathedral is home to the cathedra of the Archbishops of the city of Rio de Janeiro, Brazil. The church is dedicated to Saint Sebastian, the patron saint of Rio de Janeiro.