Kunkhyen Longchen (the Omniscient One of Vast Space) Rabjampa (1308-1363/9) was a famous Nyingma Dharma King and abbot of Samye Monastery who spent most of his time in retreat or traveling. Samye Monastery, the first monastery in Tibet, was established by King Trisong Deutsen, Shantarakshita, and Padmasambhava in 767. It is laid out as a giant mandala with the main temple in the center representing Mount Sumeru.
Along with Sakya Pandita and Je Tsongkhapa, Longchenpa is commonly recognized as one of the three main manifestations of Manjushri to have taught in Central Tibet.
He wrote the Seven Treasures, an extensive analysis of the Great Perfection tantras, gathering together the heart-essence of the teachings of Guru Padmasambhava, Yeshe Tsogyal, and Vimalamitra. Only a few of these texts have been translated into English as noted and are somewhat hard to find.
1. Treasury of Philosophy (grub mtha’ mdzod): Translated as The Precious Treasury of Philosophical Systems
2. Treasury of the Sublime Vehicle (theg mchog mdzod)
3. Treasury of Wishfulfillment (yid bzhin mdzod)
4. Treasury of Secret Instructions (man ngag mdzod): Translated as The Precious Treasury of Pith Instructions
5. Treasury of the Dharmadhatu (chos dbyings mdzod): Translated as Precious Treasury of the Basic Space of Phenomena and its commentary, The Treasure Trove of Scriptural Transmission
6. Treasury of the Natural State (gnas lugs mdzod): Translated as Precious Treasury of the Way of Abiding
7. Treasury of Word and Meaning (tshig don mdzod)