Vimalamitra

Vimalamitra was an 8th-century Indian monk about whom little is known. He was supposed to have vowed to take rebirth every hundred years with the most notable figures being Rigzin Jigme Lingpa, Khenchen Ngagchung, His Holiness Kyabje Drubwang Penjor Rinpoche and His Holiness Kyabje Yangthang Rinpoche. ' Vimalamitra' was more known to the Bhutanese and Tibetans as 'Penchen Vimalamitra' meaning 'the Great Pandita'. He was one of the eight teachers of the great Indian (now Pakistani) adept Guru Padmasambhava. Centuries later he was adopted as a literary character of terma and was attributed various works. His Holiness Chatral Sangye Dorji(1913-2016) was said to have received a mala rosary from a man who was at the time dressed as an Indian Sadhu. It was only later that Rinpoche told his attendants that he received a mala on that day from Vimalamitra in real. The attendants were curious and went back to the place where they met a sadhu only to be left lost and I found. The sadhu was not to be found anywhere. One scholar remarked that the historical Vimalamitra "would have been astonished to find himself the focus of such a tradition."

The Vima Nyingthig or "Secret Heart Essence of Vimalamitra" is the composition of Zhangton.

...
Wikipedia