Tokhtamysh–Timur war
The Tokhtamysh–Timur war was fought from 1386 to 1395 between Tokhtamysh, khan of the Golden Horde, and the warlord and conqueror Timur, founder of the Timurid Empire, in the areas of the Caucasus Mountains, Turkestan and Eastern Europe. The battle between Amir Timur and Tokhtamysh played a key role in the decline of Mongol power over early Russian principalities. Background In the late 1370s and early 1380s, Timur helped Tokhtamysh assume supreme power in the White Horde against Tokhtamysh's uncle Urus Khan. After this Tokhtamysh united the White and Blue Hordes, reuniting the Golden Horde, and launched a massive military punitive campaign against the Russian principalities between 1381 and 1382, restoring Turco-Mongol (Tatar) power in Russia after the defeat in the Battle of Kulikovo. The Golden Horde, after a period of anarchy between the early 1360s and late 1370s, briefly reestablished itself as a dominant regional power, defeating Lithuania around 1383. But Tokhtamysh had territorial ambitions in Persia and Central Asia, and on account of this he turned against his old ally, Timur. The war After the death of Abu Sa'id in 1335, the last ruler of the Ilkhanid Dynasty, a power vacuum emerged in Persia. Persia's vulnerability led to