Diaries M. Bogoslovsky (1867-1929), one of the most prominent representatives of the Moscow school of historians, pupil and successor Kluchevsky the departments of Russian history at the University of Moscow Theological Academy and was first published in its entirety. Basis is a daily record with July 1915 and November 1917 issues also preserved fragmentary record in 1913 and a diary for two months in 1919 numerous information about events and persons with whom the M. Bogoslovsky fate was pushing, the desire to write their observations in the context of Russian history make it a valuable historical source diaries, important for the understanding of the university and intellectual environment in times of crisis, all traditional values. Diary notes also allow a better understanding of the inner world of a great scientist, his outlook, to evaluate its contribution to the study of history and at the same time experience the charm of his personal, human qualities. For historians and those interested in domestic history.