took part in the war between the sons of Alexander Nevsky, that ended with the destruction of many Russian towns by both the Mongols and the Russians. In 1293 Theodore took part in Khan Dyuden war against the North-East Rus', in which 14 important towns were sacked by the Mongols. Last Years In his last years Theodore the Black became a monk and died in Yaroslavl in 1299. He was canonized due to the depth of deathbed repentance. References Sources Russian saints of the Eastern Orthodox Church Princes of Smolensk People from Yaroslavl 1230s births 1299 deaths Eastern Orthodox royal saints Rostislavichi family (Smolensk)