Book by Doctor of Historical Sciences K.A. Averyanova is devoted to one of the most interesting and mysterious issues of Russian history of the 14th century, which gave rise to a lot of controversy among historians - the problem of the so-called “Ivan Kalita font”, as a result of which several vast northern lands with centers in Galich, Uglich and Beloozero. It is these cities that Grand Duke Dmitry Donskoy in his will of 1389 refers to as “the purchases of his grandfather.” The views of previous researchers on the essence of the issue are analyzed in detail, the indications of chronicles, acts and other primary sources on this topic are examined in detail.