Shri Singha
Shri Singha - One of the early masters of the Dzogchen lineage, who was originally from China. He was a disciple of Mañjushrimitra and the main teacher of Jñanasutra. He is famous for arranging the teachings of the Pith Instruction Class (mengak dé) into four cycles: outer, inner, secret and innermost secret. His last testament, which he conferred upon Jñanasutra before passing into the rainbow body, is called the Seven Nails.