In 1242, Batu suddenly returned to Russia and led the army to launch the Mongol Russian principalities.

Vasili II, Archduke of Moscow. Because he was blinded and his eyesight was very limited, he was nicknamed "blind Archduke".

During the reign of Vasili II, almost all the independent feudal territories within the Grand Duchy of Moscow were abolished. The independence of Republican city states such as Novgorod, viatka and Pskov was weakened. In history, he made a lot of preparations for Ivan III vasiliyevich's unification of Russia. He was a highly capable talent in troubled times.

The letter sent by Mahama has reached the blind Archduke. After learning the contents of the letter, he called a group of ministers to discuss specific military affairs, including Ivan the great, who was very famous in Russian history.

In 1440, the second son of Vasili II, Lord of the Grand Duchy of Moscow, was born. Yuri, the first son of Vasili II, died early, so Vasili II gave great hope to the child. According to the proposal of the Archbishop of the Principality of Moscow, the child was named Ivan, the later Ivan the great.