He was the third son of Mikhail of Tver and the founder of the branch of Rurikid princes later called Dorogobuzh.

[3] His passivity went beyond simple submission, as when the Russian princes led by Ivan urged Aleksandr to go the Horde while he sought sanctuary in Pskov, Konstantin joined them.

[2][3] After his death, Konstantin continued to rule the principality even after Ivan transferred the bell from the Transfiguration Cathedral to Moscow.

[3] Towards the end of Konstantin's reign, there was hostility with Anastasia and Vsevolod, the widow and the son of his brother Aleksandr.

[7] Konstantin "began to take their boyars and their servants... by force", but Vsevolod was "unable to tolerate this", according to the chronicle.