The period of the reforms in the reign of Peter the Great shook Russia to her very foundations, drastically altering her historical course. It is noteworthy in many respects, particularly in the sudden appearance of many men in various walks of life capable of envisaging and of carrying out these novel measures. In the Orthodox Church, which was as profoundly affected as any other Russian institution, this phenomenon is admirably illustrated in the career of Theophan Prokopovich, the Ukrainian ecclesiastic. The range and power of his intellect were enormous; a theologian, scholar, teacher, poet, dramatist, and man of affairs, he merits respectful treatment both from students of theology and literature as well as politics. He was the Tsar's intimate associate, well-known to Catholic and Protestant theologians abroad, friend of the poet Kantemir and the historian Tatischev, and a man who could influence the imperial succession itself.