The Nyingon Choktrul incarnations were masters of the Katok branch of the Nyingma tradition with seats at both Katok Dorjeden and Nyingon Monastery. The line originated when the First Drime Zhingkyong identified a boy, Jangchub Dorje, as the reincarnation of a lama named Sanggye Tashi who had resided at Nyingon Monastery and had served at Katok during the crucial period of transition and revival.