Khacho Deden was a hermitage associated with Jonang Monastery, located about 2 hours walk from the famous Kumbum. Tukje Tsondru practiced there and wrote several of his Kālacakra manuals. Dolpopa is said to have realized his zhentong views while at the Khacho Deden hermitage.
Akester, Matthew. 2016. Jamyang Khyentse Wangpo's Guide to Central Tibet. Chicago, IL: Serindia Publications, p. 622.
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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.