The faithful Grand Duke Dimitri Donskoi, the son of Prince John of Red and Princess Alexandra, the grandson of John Kalita, was born on October 12, 1350 and was brought up in love for God and the Holy Church under the direction of St. Alexius of Moscow. In the education of the prince, St. Sergius of Radonezh contributed much to the saint. From an early age, Demetrius, listening to his father's stories about the glorious ancestors - Alexander Nevsky, Daniil Moskovsky and other pious princes, became stronger in responsibility for his origin. A nine-year-old boy after the death of his father, Dimitri went to the Horde and received permission from the khan to inherit his father's reign.