Улугбек
Timur's grandson Ulugh Beg (1409–1449) ruled Transoxania and during his rule trade and economy of Transoxania achieved significant development. Ulugh Beg built an astronomical observatory near Samarkand in 1429 and wrote his work Zij-i-Sultani, which comprises the theories of astronomy and a catalogue of over 1000 stars with their precise positions on the celestial sphere.