Life and Rule
Basil, the elder brother, succeeded to the throne of Yaroslavl after the death of their father. His reign was burdened with concerns and sorrows, for the city and surrounding villages had been devastated by the Tatar invasion, leaving many households without shelter or food. To secure the good will of the Tatar Khan, the prince journeyed more than once to the Horde.
The synaxarion records that Basil bore his trials without complaint, ruled like a true Christian, avoided disputes with neighboring princes, cared for the unfortunate among his subjects, and built churches. He also suffered the loss of his only son. He died in 1249.
Constantine succeeded his elder brother and sought to follow his example, though he continued to witness the pillage and killing inflicted by the Tatars. In 1257 the Tatars fell upon Yaroslavl itself, and Constantine went out to fight; he gave up his life for his country in the battle. Historical accounts associate this engagement with a clash at Tugovaya Gora, a hill outside Yaroslavl, after which the city was devastated by the Golden Horde.