[A]ll the most sacred Festivals of Our Lord made Man, in all things pertaining to the same, viz.: in the Office of Baptism, the celebration of Masses, in the method of chanting, shall be celebrated in one and the same way, namely, according to the sample which we have received in writing from the Roman Church. And also, throughout the course of the whole year, the festivals of the Saints are to be kept on one and the same day, with their proper psalmody and chant, according to the Martyrology of the same Roman Church.
From the Second Council of Clovesho in 747 presided over by Archbishop Cuthbert.
