Gyantse town was established between the 14th and 15th centuries as a feudatory, with the Sakya sect playing a crucial overlord role. During this period, the Buddhist monuments were also built with the Dzong (the old fort) followed by the Kumbum and the Pekor monastery. All three structures have been dated. Tsuklakhang monastery was built by prince Rabton Kunzang Phak between 1418–25. However, Gyantse's historical importance declined by the end of the 15th century.