Renowned Nyingma master, wrote extensively on Nyingma and Dzogchen including the Seven Treasuries, and transmitted the Longchen Nyingtik lineage to Jigme Lingpa.
Rongzom Pandita (1012-1088)
One of the three “omniscient” Nyingma masters with Longchepa and Ju Mipham, wrote Entering the Way of the Great Vehicle to explain Dzogchen as summit of Madhyamaka (wikipedia / rigpawiki)
Madhyamaka Lineage in India
Kamalashila (c.740-795 CE)
Went to Tibet with his master Shantarakshita, defeated the Chan master Moheyan (摩诃衍) at the “Council of Lhasa”, thereby founding Tibetan Buddhism on the Indian Madhyamaka tradition (wikipedia / rigpawiki).