Jnanasutra
Tib., ye shes mdo5th - 6th century
A sixth century Indian master (died 531) who is part of the Dzogchen lineage. He was a disciple of Sri Singha and later revealed the so-called secret instructions (Tib., snying thig gsang ba'i ngag) of the Nyingtig teachings.
He also is said to have been a close friend and teacher of Vimalamitra; though the time scale involved creates some doubts about this.