The Mausoleum of Khoja Ahmed Yasawi, in the town of Yasi, now Turkestan, was built at the time of Timur (Tamerlane), from 1389 to 1405. In this partly unfinished building, Persian master builders experimented with architectural and structural solutions later used in the construction of Samarkand, the capital of the Timurid Empire. Today, it is one of the largest and best-preserved constructions of the Timurid period.The Mausoleum of Khoja Ahmed Yasawi is an outstanding achievement in the Timurid architecture, and it has significantly contributed to the development of Islamic religious architecture. Criterion iii: The mausoleum and its site represent an exceptional testimony to the culture of the Central Asian region, and to the development of building technology. Criterion iv: The Mausoleum of Khoja Ahmed Yasawi was a prototype for the development of a major building type in the Timurid period, becoming a significant reference in the history of Timurid architecture.