sentences:  In 1711, Chuzang Lozang-tenpay-gyeltsen built a new Tantric College, Ngagpa Dratsang.In 1723, the Qing armies severely damaged the four great monasteries of the Qinghai region – Kumbum, Gonlung, Serkog and Chuzang and many monks fled.Soon afterwards, the Qing commander asked the 21st Throne Holder to convert the new Ngagpa Dratsang into a Medical College, and this was done.