19. In the Latin Church there is usually no difficulty in commemorating the bishop in whose diocese the priest celebrates Mass. We Ourselves have dealt with this subject in Our work de Sacrificio Missae (sect. 1, no. 220 in the Latin edition) and have shown that the priest who celebrates Mass in any diocese should commemorate the bishop of that diocese rather than the bishop in whose diocese he was ordained or the one to whose Ordinary jurisdiction he is subject. We added that it was not permissible for regular clergy to commemorate their Superior General or for other priests to commemorate during Mass any lesser prelate of a separate territory to whom they are subject. For this honor is to be conferred only on the superior or prelate who possesses the episcopal authority and order. In that work We adduced the writings of the men who transmit to us all these matters and establish them by their testimony. So at this point We will add no more except to quote the remarks of the above-mentioned Dominicus Georgius in his treatise De Liturgia Romani Pontificis in which he studied many ancient manuscripts, which has appeared since the publication of Our work: "Nearly all the most ancient copies of the sacred canon of the Mass note the name of the bishop after the Roman Pontiff as is attested by Florus and the more ancient writers on the Mass whom We give in an appendix" (Op. cit., vol. 3, chap. 3, no. 23, p. 52).