Natalis seems to have been applied to the day or anniversary of a Bishop’s consecration as well as to the festivals of Martyrs in the Calendar. Cf. Serm. IV. chap. 4, illi ergo hunc servitutis nostræ natalitium diem ascribamus. One reason for the shortness of this sermon, which used to be joined with Sermon II. (a few necessary alterations in the text of the latter being made) is, I think, rightly given by the Ballerinii: “perhaps” they say, “the unusual length of the ceremonies that day did not allow of a longer sermon.”