Konstantin Ulemets

Holy Right-⁠believing Prince Constantine Ulemets was a prince of Yaroslavl, a son of Prince Fyodor Rostislavich and Princess Anna. The Russian Church venerates him as a wonderworker of Yaroslavl, and his veneration is chiefly local. He died not later than 1321.

The nickname Ulemets means "the learned" or "the wise". The chronicles do not make clear whether he reigned together with his brother David. It is said that he devoted himself to study and, according to his life, died a virgin, unmarried.

His relics, those of his father Fyodor and of his brother David were found in 1463 in the cathedral of the Transfiguration of the Savior in Yaroslavl. The chronicle account of their finding says that in the monastery of the Holy Savior at Yaroslavl three grand princes lay above ground, Fyodor Rostislavich and his sons David and Constantine. Fyodor was a very tall man, and the two sons, shorter than he, lay under his arms, all in a single coffin.

Constantine is venerated as a right-⁠believing prince and wonderworker of Yaroslavl. By the old calendar his commemoration is kept on 5 March, for the finding of the relics, on 23 May, the day of the Synaxis of the saints of Rostov, on the Sunday before 10 August, with the Synaxis of the saints of Smolensk, and on 19 September and 4 October, with the Synaxis of the saints of Kazan. An icon with him, his father and his brother was painted soon after their canonization, and in the sixteenth century an icon of the princes of Yaroslavl with their life was made.