However, the terms of the Union of Horodlo negotiated by Polish King Jogaila, which discriminated against Orthodox Christians, caused Lithuania to lose its influence over the Russian states.

During the whole of this time no tribute was paid to the khan, Olug Moxammat, though vast sums of money were collected in the Moscow treasury for military purposes.

[8] The growing influence of Moscow abroad was underlined by the fact that Vasily married his daughter Anna to Emperor John VIII Palaeologus of Byzantium.

With the growth of princely authority in Moscow, the judicial powers of landowners were partially diminished and transferred to Vasily's deputies and heads of volosts.

[citation needed] Chronicles speak of a monk called Lazar the Serb who arrived from Serbia, inventing and building a clock on a tower in the Grand Prince's Terem Palace in Moscow behind the Cathedral of the Annunciation at the request of Vasily I, in 1404.

[10][11] The most important ecclesiastical event of the reign was the elevation of the Bulgarian, Gregory Tsamblak, to the metropolitan see of Kiev by Vytautas, grand-duke of Lithuania; the immediate political consequence of which was the weakening of the hold of Moscow on southwestern Rus'.