Maria Borisovna of Tver

Tver

Tver is a city and the administrative center of Tver Oblast, Russia. Population: 403,726 ; 408,903 ;...

(Мария Борисовна in Russian

Russian language

Russian is a Slavic language used primarily in Russia, Belarus, Uzbekistan, Kazakhstan, Tajikistan and Kyrgyzstan. It is an unofficial but widely spoken language in Ukraine, Moldova, Latvia, Turkmenistan and Estonia and, to a lesser extent, the other countries that were once constituent republics...

) (1442? – 1467) was the first wife of Grand Prince

Grand Prince

The title grand prince or great prince ranked in honour below emperor and tsar and above a sovereign prince .Grand duke is the usual and established, though not literal, translation of these terms in English and Romance languages, which do not normally use separate words for a "prince" who reigns...

 Ivan III and daughter of Boris Alexandrovich of Tver

Tver

Tver is a city and the administrative center of Tver Oblast, Russia. Population: 403,726 ; 408,903 ;...

.

When Vasili II

Vasili II of Russia

Vasily II Vasiliyevich Tyomniy was the Grand Prince of Moscow whose long reign was plagued by the greatest civil war of Old Russian history....

 (Ivan III's father) was getting ready to attack Dmitry Shemyaka

Dmitry Shemyaka

Dmitriy Yurievich Shemyaka was the second son of Yury of Zvenigorod by Anastasia of Smolensk and grandson of Dmitri Donskoi. His hereditary patrimony was the rich Northern town Galich-Mersky...

, he found an ally in the person of Boris of Tver. The two decided to seal the alliance by arranging a betrothal between the future Ivan III and Maria of Tver in 1452. It appears that she died from poison

Poison

In the context of biology, poisons are substances that can cause disturbances to organisms, usually by chemical reaction or other activity on the molecular scale, when a sufficient quantity is absorbed by an organism....

ing in 1467. However, if one is to believe Joseph Volotsky

Joseph Volotsky

Joseph Volotsky — also known as Joseph of Volotsk or Joseph of Volokolamsk ; secular name Ivan Sanin — was a prominent caesaropapist ideologist of the Russian Orthodox Church who led the party defending monastic landownership.He is a saint ; his memory is celebrated on 9 September and 18...

, she had been suffering from "infirmity" since childhood. She gave birth to Ivan the Young

Ivan the Young

Ivan Ivanovich was the eldest son and heir of Ivan III from his first marriage to Maria of Tver.Ivan's father empowered him to deal with most administrative and military affairs of the state in order to make ordinary...

 in 1458.
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