Dmitry Donskoy
Saint Dmitry Ivanovich Donskoy , or Dmitry of the Don, sometimes referred to simply as Dmitry , son of Ivan II the Fair of Moscow , reigned as the Prince of Moscow from 1359 and Grand Prince of Vladimir from 1363 to his death. He was the first prince of Moscow to openly challenge Mongol authority in Russia. His nickname, Donskoy , alludes to his great victory against the Tatars in the Battle of Kulikovo , which took place on the Don River. He is venerated as a Saint in the Orthodox Church with his feast day onMay.
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Source: Wikipedia