Boris of Tver
Encyclopedia
Boris of Tver or Boris the Great (ca. 1399–February 10 1461) was a prince of Tver.

Boris, the son of Alexander II of Tver, was Grand Prince of Tver
Grand Prince of Tver
The title of Prince of Tver was borne by the head of the branch of the Rurikid dynasty that ruled the Principality of Tver. In 1247 Tver was allocated to Grand Prince Alexander Nevsky, and became an independent principality...

 from April 22 1426 to his death. He first married to Anastasia Andreevna of Mozhaysk
Mozhaysk
Mozhaysk is a town and the administrative center of Mozhaysky District of Moscow Oblast, Russia, located to the west from the Russian capital, on the historic road leading to Smolensk and then to Poland. Population:...

 and had a daughter Maria of Tver
Maria of Tver
Maria Borisovna of Tver was the first wife of Grand Prince Ivan III and daughter of Boris Alexandrovich of Tver....

 (future wife of Ivan III of Moscow), second to Anastasia Alexandrovna of Suzdal
Suzdal
Suzdal is a town in Vladimir Oblast, Russia, situated northeast of Moscow, from the city of Vladimir, on the Kamenka River. Population: -History:...

, and had two sons - Mikhail III of Tver
Mikhail III of Tver
Mikhail III of Tver or Michael the Exile was the last prince of Tver.Mikhail was the son of Boris of Tver and Anastasia of Suzdal . He was Grand Prince of Tver from February 10 1461 to 1485...

 and Alexander.
During his reign, the story of Third Rome
Third Rome
The term Third Rome describes the idea that some European city, state, or country is the successor to the legacy of the Roman Empire and its successor state, the Byzantine Empire ....

("the second Constantine") started in Tver, when the monk Foma (Thomas) of Tver had written The Eulogy of the Pious Grand Prince Boris Alexandrovich in 1453.
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