1. Longchenpa



Longchen Rabjampa, Drimé Özer, commonly abbreviated to Longchenpa, was a major teacher in the Nyingma school of Tibetan Buddhism. He systematized the Nyingma teachings in his ‘Seven Treasures’ and wrote extensively on Dzogchen. He transmitted the Longchen Nyingtik cycle of teachings and practice to Jikmé Lingpa, and it has since become one of the most widely practised of traditions.

Dzogchen, or the "Great Perfection," is considered by many to be the apex of Tibetan Buddhism, and Longchen Rabjam is the most celebrated of all the saints of this tradition.

Sources:
https://www.lotsawahouse.org/tibetan...ngchen-rabjam/
http://www.abuddhistlibrary.com/Budd...wel%20Ship.htm
https://www.simonandschuster.com/boo.../9780861716401