The common purpose of the first eight councils was to determine whether specific theological novelties were orthodox or heretical (not orthodox). The rest of the councils, all held in Western Europe, have dealt chiefly with church discipline and morals. Two of them, the Second Council of Lyons and the Council of Ferrara-Florence, were occupied with abortive attempts at reconciliation between East and West. Conciliar theory, which held that an ecumenical council is superior to the pope, played a central role in attempts to heal the Great Schism. Conciliar theory was in its heyday at the Council of Constance (see Schism, Great). The Council of Trent, convened to deal with the Protestant Reformation, was probably the most far-reaching in its effects. Pope John XXIII established as one of the principal themes of the Second Vatican Council the reunion of all Christians with the Church of Rome.