Dawa Gyaltsen was a Dzogchen master who lived in the 8th century in the area of Zhangzhung. His body of work includes the Fivefold Teaching:Vision is mind.
Mind is empty.
Emptiness is clear light.
Clear light is union.
Union is great bliss.
Simhanada is a form of Avalokiteshvara connected with removing illness caused by nagas. Simhanada Avalokiteshavara belongs to the KriyaTantra classification and arises from the Simahanada Tantra and the text of the Arya Avalokiteshvara Dharani.
His primary activity is to remove sickness and disease especially illness caused by nagas. Jowo Atisha and Mal Lotsawa popularized the practice of Simhanada in the land of Tibet.
Simhanada Avalokiteshvara is known as seng ge dra chen re zi in .