He entered an alliance with theGrand Duchy of Lithuania in 1392 and marriedSophia, the only daughter ofVytautas, though the alliance turned out to be fragile, and they waged war against each other in 1406–1408.
While still a young man, Vasily, who was the eldest son of Grand Prince Dmitry Donskoy (ruled Moscow 1359–89), travelled to the Tatar khan Tokhtamysh (1383) to obtain the Khan'syarlik (patent) for his father for the title of grand prince of Vladimir. Diplomatically overcoming the challenge of the prince of Tver, who also sought the patent, Vasily succeeded in his mission. But he was subsequently kept atTokhtamysh's court as a hostage until 1386 when, taking advantage of Tokhtamysh's conflict with his suzerain Timur Lenk (Tamerlane), he escaped and returned to Moscow.[3]
To prevent Muscovy from being attacked by theGolden Horde, Vasily I entered into analliance with theGrand Duchy of Lithuania in 1392 and marriedSophia of Lithuania, the only daughter ofVytautas the Great. The alliance turned out to be fragile, and they waged war against each other in 1406–1408. Vytautas had positioned himself as an unifier of all Rus’ lands, the Polish historianKoneczny spoke of the potentiality "that could have been realised had the program of the subjugation of all of Rus’ been implemented". Furthermore, he saw the potentiality of theGrand Duchy of Lithuania becoming an empire by virtue of all of Rus’ being under Lithuanian domination.[6] Vytautas, thus attacked Novgorod and Pskov, clashing with his son-in-law Vasily but later making peace. This peace allowed Vytautas to strike against the Teutonic order at theBattle of Grunwald. However, the terms of theUnion of Horodlo negotiated by Polish KingJogaila, which discriminated against Orthodox Christians, caused Lithuania to lose its influence over the Russian states.[7]
Mongol emirTimur raided the Slavic lands in 1395; he ruined theVolga region but did not penetrate as far asMoscow. Timur's raid was of service to the Muscovite prince as it damaged theGolden Horde, which for the next twelve years was in a state of anarchy. During the whole of this time no tribute was paid to thekhan,Olug Moxammat, though vast sums of money were collected in the Moscow treasury for military purposes.[8]
In 1408Edigu burntNizhny Novgorod,Gorodets,Rostov, and many other towns but failed to takeMoscow, though he had still burnt it. In 1412, however, Vasily found it necessary to pay the long-deferred visit of submission to the Horde.[8]
During his reign,feudallandownership kept growing. With the growth of princely authority in Moscow, thejudicial powers of landowners were partially diminished and transferred to Vasily's deputies and heads ofvolosts.[citation needed]
Chronicles speak of a monk calledLazar the Serb who arrived from Serbia, inventing and building a clock on a tower in the Grand Prince'sTerem Palace in Moscow behind theCathedral of the Annunciation at the request of Vasily I, in 1404. It was the first evermechanical clock in Moscow and the first in any Russian city.[9] It was among the first ten such advanced clocks in Europe, and was regarded as a technical miracle at the time.[10][11]
The most important ecclesiastical event of the reign was the elevation of the Bulgarian,Gregory Tsamblak, to the metropolitan see of Kiev byVytautas, grand-duke of Lithuania; the immediate political consequence of which was the weakening of the hold of Moscow on southwestern Rus'.[8]
Vasily marriedSophia of Lithuania, the only child ofVytautas the Great and his wife,Anna. They had nine known children, five boys (of which only one survived to mature adulthood) and four girls:
Yury Vasilievich (30 March 1395 – 30 November 1400)
Ivan Vasilievich (15 January 1397 – 20 July 1417), died on the way fromKolomna toMoscow as a result of "pestilence", just six months after marrying the daughter of Prince Ivan Vladimirovich ofPronsk and receiving the inheritance ofNizhny Novgorod
Anastasia Vasilievna (d. 1470), wife of Vladymir Alexander, Prince ofKiev. Her husband was a son of Vladymir, Prince of Kiev. His paternal grandparents wereAlgirdas andMaria of Vitebsk.
Daniil Vasilievich (6 December 1400 – May 1402), died of pestilence
Vasilisa Vasilievna, wife of Alexander Ivanovich "Brukhaty", Prince ofSuzdal, and Alexander Daniilovich "Vzmetenj", Prince of Suzdal.
Simeon Vasilievich (13 January – 7 April 1405), died of pestilence
Maria Vasilievna, wife of Yuri Patrikievich. Her husband was a son ofPatrikas, Prince ofStarodub, and his wife, Helena. His paternal grandfather wasNarimantas.