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 of his principality and was released with honor. Later, he married Princess Ksenia, and they had a daughter, Maria, and a son, Vasily, who died in childhood. In 1249, after falling seriously ill, Prince Vasily passed away and was buried in the Assumption Cathedral of Yaroslavl.
After his death, Konstantin took over the rule. In 1257, he fought against the Mongol-Tatars and fell in battle, defending Yaroslavl. His body was also buried in the Assumption Church next to his brother.
In 1501, after 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 Duke Ivan III. The relics were later moved back to the Assumption Cathedral, where they are kept in a specially arranged tomb.
The memory of the holy princes Vasily and Konstantin is celebrated twice a year: on July 3/16 and June 8/21, when the finding of their relics and the day of the battle on Mount Tugovaya are commemorated.
