See equally concerned to insist on, the one to make the transference (_translatio_) from the Greeks to the Germans appear entirely the Pope's work, and so establish his right of overseeing or cancelling his rival's election, the others by setting the Emperor at the head of the Church to reduce the Pope to the place of chief bishop of his realm[135]. His headship was dwelt upon chiefly in the two duties already noticed. As the counterpart of the Mussulman Commander of the Faithful, he was leader of the Church militant against her infidel foes, was in this capacity summoned to conduct crusades, and in later times recognized chief of the confederacies against the conquering Ottomans. As representative of the whole Christian people, it belonged to him to convoke General Councils, a right not without importance even when exercised concurrently with the Pope, but far more weighty when the object of the council was to settle a disputed election, or, as at Constance, to depose the reigning pontiff himself. [Sidenote: The Coronation ceremonies.] No better illustrations can be desired than those to be found in the office for the imperial coronation at Rome, too long to be transcribed here, but well worthy of an attentive study[136]. The rites prescribed in it are rights of consecration to a religious office: the Emperor, besides the sword, globe, and sceptre of temporal power, receives a ring as the symbol of his faith, is ordained a subdeacon, assists the Pope in celebrating mass, partakes as a clerical person of the communion in both kinds, is admitted a canon of St. Peter and St. John Lateran. The oath to be taken by an elector begins, 'Ego N. volo regem Romanorum in Cæsarem promovendum, temporale caput populo Christiano eligere.' The Emperor swears to cherish and defend the Holy Roman Church and her bishop: the Pope prays after the reading of the Gospel, 'Deus qui ad prædicandum æterni regni evangelium Imperium Romanum præparasti, prætende famulo tuo Imperatori nostro arma cœlestia.' Among the Emperor's official titles there occur these: 'Head of Christendom,' 'Defender and Advocate of the Christian Church,' 'Temporal Head of the Faithful,' 'Protector of Palestine and of the Catholic Faith[137].' [Sidenote: The rights of the Empire proved from the Bible.]