Battle of Kulikovo

The Battle of Kulikovo was fought between the forces of Mamai, a powerful Mongol military commander of the Golden Horde, and Russian forces led by Grand Prince Dmitry of Moscow. The battle took place on 8 September 1380, at Kulikovo Field near the Don River and was won by Dmitry, who became known as Donskoy after the battle.

Although the victory did not end Mongol domination over Russia, it is traditionally regarded as the turning point at which Mongol influence began to wane and Moscow's power began to rise. The battle would allow Moscow to strengthen its claims of ascendancy over the other Russian principalities, in which it would ultimately become the centre of a centralized Russian state.

Source: Wikipedia