Interesting topic! I googled Nagas and got some interesting info via
http://www.khandro.net/mysterious_naga.htmThe Heart Sutra was apparently transmitted to Nagarjuna via Water Beings.
GATEy GATEy PARAGATEy PARASAMGATEy BODHI SOHA (Beyond,Beyond,completely Beyond, Perfectly Beyond, Awakening, Yes!!
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Nag'arjuna
The Indian mahasiddha, Nagarjuna, received his illuminating insights and tantric empowerment with the help of the nagas in the lake beside which he meditated. Nagarjuna is one of the main champions of Buddhist philosophy, and is traditionally portrayed with a sunshade or halo formed by a multi-headed serpent. He is called the Second Buddha, partly in tribute to his having established the Madhyamaka [Middle-Way, ie. neither materialist nor nihilist nor idealist] school of philosophy.
See the Buddha's protector-naga in the process of transforming into Nagarjuna unsheathing the sword of wisdom at the Asian Art web site.
As there are serpents in Tibet, and nagas known as kLu play a role in the symbolism of Himalayan Buddhism and in Tibetan mythology, so Nagarjuna is known as Lu-trub.
The tradition of Sera Monastery holds that when Sakya Yeshe was on his way back from visiting China, it so happened that the set of Tengyur (Buddhist scriptures) donated by the emperor fell into the water while the party was fording a river. The travellers could see that the texts were hopelessly lost and so, distraught, they continued on their way back to Sera.
When the caravan finally got back, the monks told them that just before their return, an old man with attendants had visited Sera and presented a set of scriptures to the monastery. He said that he was delivering it for Sakya Yeshe. It was believed that the old man was really a Naga king, for when the texts were examined, it was found that they were still a bit damp.
A bronze naga-king from Densatil monastery, East Tibet, undergoing transformation.
The traditional life-story [Tibetan: namthar] of Niguma, the female companion of Naropa, begins during the time of one of the earliest Buddhas in a region covered by water ruled by a great Naga King. This Naga was an accomplished and compassionate disciple of that Buddha and gave his permission for the miraculous drying up the water for the purpose of erecting a great temple and monastery. A bustling city grew up around these which acquired a certain reputation, and came to be called The Land of Great Magic. This is the place that Niguma was born.
Niguma developed the powerful tantric techniques referred to as the Five Dharmas of Niguma. The best known is called the Dream Yoga of Niguma. Her disciple, Naljor, is considered the head of the Shangpa Kagyu denomination of Tibetan Buddhism.
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