Rato is a Geluk monastery in Chushur that was founded by the Kadam master Gyachang Ruba in 1205, apparently originally under the name Rawa. In the fifteenth century Kunkhyen Yonten Gyatso taught there, strongly advocating the teachings of Tsongkhapa, and the community split into Rawa To (Upper Rawa), which followed the Geluk tradition, and Rawa Me (Lower Rawa), which followed Sakya.
Akester, Matthew. 2016. Jamyang Khyentse Wangpo's Guide to Central Tibet. Chicago, IL: Serindia Publications, pp. 223-227.
Gyurme Dorje. 2009. Tibet Handbook. Bath: Footprint, p. 187.
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The TBRC RID number refers to the unique ID assigned by the Tibetan Buddhist Resource Center (TBRC.org) to each historical figure in their database of Tibetan literature.