26. We Ourselves in Our treatise de Sacrificio Missae, sect. 1, no. 221, have already discussed the commemoration in the canon of the emperor or king, as is customary in some districts belonging to their temporal realm. Cardinal Bona provides evidence that in many Latin churches the name of the king is commemorated in the canon (Rer. Liturgicar. bk. 2, chap. 11, no. 4). Furthermore Martene in his work de antiquis Ecclesiae Ritibus, bk. 1, chap. 4, art. 8, no. 9, after adducing the appropriate evidence, comes to the following conclusion: "From the unchanging tradition of the Church as it was received from the Apostles, it is certain that prayers for kings and princes have always been offered during the sacred mysteries." It is quite evident that the writer is here relying on the words of the Apostle (1 Tm 2) commanding that prayers and petitions be made for kings and all who are in high places, as well as on the text of the apostolic constitutions: "We also beseech You, Lord, for the king and for those who are in high places and for all the army that our affairs may prosper" and "Let us pray for kings and those of exalted power that our affairs may enjoy peace" (Cotelerius, Patrum Apostolicorum, col. 1, bk. 8, chap. 12 and 13). On this point Gregorius too may be consulted (de Liturgia Rom. Pont., bk. 4, chap. 3, no. 4). However it may be with the dispute conducted between Balutius and Lupus, on the date when the emperor's name was replaced by that of the king in the lands subject to the sway of kings (a question treated at great length by Lupus (can. 10, Dictatus S. Greg. VII), it is sufficiently established that in the Latin church a commemoration of the king is made in those districts in which it has long been an accepted custom or where a concession of the Apostolic See has allowed it, as Meratus remarks (ad Gavantum, vol. 1, pt. 1, p. 539, no. 6 of the Roman edition).