The article deals with some problems of formation of a Slavic Homiliar and translating a Sermon for Nativity of Virgin Mary – N 21 of Codex Suprasliensis – a text created in Preslav in the middle of the 10th c. – and relationship of this text in the development of the Slavic Homiliar. Recently scholars have been speaking in an ever more convincing manner of “early” and “late” Preslav. The author believes that when trying to find the states of this development, this direction should be followed.