A stone fragment of Amir Timur's military campaign against Tokhtamysh in 1391 is currently preserved in the State Hermitage. The inscription was found in the Altyn-Chuku Mountains (present-day Kazakhstan) in the Karsakpay Gorge.
The inscription emphasizes the scale and significance of the military campaign. It contains a three-line inscription from the Quran: "In the name of Allah, the Most Merciful, the Most Compassionate! Lord of rulers, Sacredness of Truth, Watchful Protector, Mighty and Powerful, Wise Judge of life and death!"
The remaining eight lines are engraved in the Uyghur alphabet, in the Chagatai language: "In the middle month of the spring of the Year of the Sheep, seven hundred and ninety-three (April 6, 1391), the Sultan of Turan, Timurbek, rose up against the Bulgarian Khan Tokhtamysh Khan with three hundred thousand soldiers for Islam. Arriving here, he built this fortress as an unforgettable mark. God willing, let the Lord do justice! May our Lord have mercy on the people of the land! Let them remember us in prayer!"
Amir Timur's military campaign in 1391 ended with a battle on the Kondurcha River (present-day Samara region of Russia). As a result, Tokhtamysh was defeated in this battle.