The holy and righteous princes Vasily and Konstantin were the sons of the first prince of Yaroslavl, Vsevolod Konstantinovich. In 1238, during the Mongol-Tatar invasion, they lost their father and older brother Vasil'k Rostovsky. Vasily, becoming a prince, strengthened the spirit of his subjects and restored the churches destroyed by the enemies.
In 1239, he went to the Horde to obtain confirmation for the Yaroslavl principality and was released with honor. Later, in 1245, he married Princess Ksenia, and they had a daughter, Maria, and a son, Vasily, who died in infancy.
In 1249, after an illness, Prince Vasily passed away and was buried in the Assumption Cathedral in Yaroslavl. His brother Konstantin took over the rule and, fighting against the Mongol-Tatars, fell in battle on July 3, 1257. His body was also buried in the Assumption Church.
In 1501, during a fire, the incorrupt relics of the princes were found. At the request of the people, they were transferred to a new church built by the order of Grand Prince Ivan III. The relics were again transferred to the Assumption Cathedral, where they are kept in a special tomb.
The memory of the holy princes Vasily and Konstantin is celebrated twice a year: on July 3/16 – on the day of the battle on Mount Tugovaya, and on June 8/21 – on the day of the discovery of their relics.
