Note 419 — Chapter I · THE CHURCH’S YEAR (continued 3)
Reading edition
The disagreement arose from the fact that the ancient missals (Sacramentorum libri), only mentioned the month without specifying the week when the Ember fasts were to be observed. See Berno of Reichenau (Migne, Patr. Lat., cxlii. 1097), whose small treatise, composed between 1020 and 1031, deals with the question.