The Gongon Lhakhang temple, in Oyuk Township, was said to be built by Songtsen Gampo, and frequented by Padmasambhava and his students Namkhai Nyingpo and King Trisong Detsen in the 8th century [REF].
The Gelukpa monasteries of Drungzhi and Sogchen are located in the Tobgyel Valley [REF].