He was the grandson of Timur, a merciless conqueror who exterminated hundreds of thousands of people. He was the son of Shahrukh, the God-fearing ruler of Transoxiana, between the Syr Darya and Amu Darya rivers with his capital in Samarkand. At the age of fifteen, he himself became the ruler of the great city, but he went down in history as a brilliant astronomer - his star atlas “Zij Guragoni” had no equal: Muhammad-Taragai - this is the name he received at birth. People called him Ulugbek, the Grand Duke. But in the lives of great people - rulers, warriors, scientists - there is always a place not only for honor, glory and love, but also for the pain of loss, disappointment, insidious deception and betrayal.