Matsyendranath

Matsyendranath is the first Guru of the Naths. According to legend he was a fisherman from Kamarupa in Assam who hooked a giant fish and was swallowed alive by it. The fish came to rest  on the ocean floor near a hidden palace in which  Shiva had chosen to transmit his  most secret teaching to his consort Uma. From within the belly of the fish  Matsyendranath overheard these secret teachings and received his mantra  directly from Shiva. Shiva had no option but to make Matsyendranath his desciple. Matsyendranath spent twelve years perfecting his sadhana in the belly of the fish until he was eventually disgorged onto dry land.He had many desciples.The most prominent was Gorakhnath.
Matsyendranath is the patron diety of Nepal, and is believed to have brought the first grains  of rice to this Himalayan Kingdom.
Uttar Pradesh Chief Minister, Yogi Adityanath belongs to this tradition.