Gyalwa Chokyang was one of the twenty-five disciples of Guru Rinpoche, and was ordained as a monk by Shantarakshita.
During the empowerment of Kagyé given by Guru Rinpoche in the caves of Samye Chimpu, his flower fell on the mandala of Hayagriva.
Through his practice, he was able to take on the form of the deity, and heard the sound of a horse's neigh coming from the crown of his head.
Gyalwa Chogyang was a student and one of the disciple of Padmasambhava, that is typically depicted with a green horse head atop his own head.
The 25 disciples of Padmasambhava also called as Guru Rinpoche were instrumental in the spread of Buddha's teachings throughout Tibet. They emerged as masters, having achieved great wisdom, understanding, and success.
These Mahasiddhas are believed to have special future incarnations due to their connection with Padmasambhava's terma treasures.
To this day, these disciples continue to be reborn as Tertons, imparting the teachings of Padmasambhava in a contemporary and authentic way to new .