The monograph is devoted to an important problem of medieval Russia - the history of a large feudal patrimony. The book examines the patrimony of the Moscow Simonov Monastery: the genesis of the monastery patrimony, the growth and ways of its development in close cooperation with other aspects of the political and socio-economic life of Russia of the XIV-XVI centuries are studied. A wide range of sources is used, a significant part of which has not previously been published.