Tagphu Pemavajra is famously known for being the first lama to transmit the lineage of Dorje Shugden that we are practicing now, as well as for being the most influential teacher to Kyabje Pabongka Rinpoche, the father of the Gelugpa lineage, teachings and practices as we know it today.
Tagphu Pemavajra’s line of incarnations can be traced all the way back to Buddha Shakyamuni’s time, when he was Mahasiddha Dharmati. From that time onward, he emanated several great lineages, each being well respected and remembered as a great practitioner. In this line of incarnations are Sherab Dorje of the Kadampas, Milarepa’s disciple Sewan Repa, Ra Lotsawa’s disciple Trehor Lobsang and the Sakya Lama Shakya Chogden. Incarnations like Tagphu Pemavajra’s teach us that all lineages within the Buddhist sect are pure and ultimately, all of them can lead us equally to enlightenment.
The first recognized and official reincarnation of the Tagphu lineage was Lobsang Tenpai Gyaltsen, who lived between the years of 1714 to 1762. This incarnation was one of the earliest Gelug masters to have written commentaries on the Naro Kacho form of Vajrayogini, which came down from Naropa. It was written at the request of Changkya Rolpai Dorje. Both of these great lamas are known to have passed many teachings and practices to each other, preserving these holy teachings throughout the generations. In recent years, it has been recognised that Pabongkha Rinpoche – Tagphu Pemavajra’s disciples – is an incarnation of Changkya Rolpai Dorje. This shows that the connection established between these two great masters in previous lives has been maintained over many lifetimes.
Today, most of what we know about Tagphu Pemavajra is only found in the writings of Pabongkha Rinpoche, his closest disciple with whom he eventually shared a mutually beneficial relationship. The relationship of Guru and disciple between Tagphu Pemavajra and Pabongkha Rinpoche was a very unique one in that they both requested and shared teachings with each other, as equals.
Mahasiddha Tagphu Pemavajra was also known for having miraculous abilities to astral travel to the pure lands of the Buddhas. On one occasion, Tagphu Pemavajra astral travelled to Tushita Heaven and had an audience with Lama Tsongkhapa and his Eight Great Disciples. It was here that he requested Duldzin Drakpa Gyeltsen to elucidate Dorje Shugden’s practice. In response, a miraculous rainbow streamed from Duldzin Drakpa Gyeltsen’s heart to Lama Tsongkhapa’s heart, then streamed back again to Duldzin Drakpa Gyeltsen. Another rainbow then shone from Duldzin Drakpa Gyeltsen to underneath Lama Tsongkhapa’s throne. As this happened Dorje Shugden and his 32-deity mandala manifested out from under Lama Tsongkhapa’s throne and Dorje Shugden himself came forth to expound the teachings directly to Tagphu Pemavajra. Upon completion of the teachings, the mandala dissolved back under Lama Tsongkhapa’s throne.
As soon as Tagphu Pemavajra’s consciousness returned to his physical body, he began to write down all that he had learnt in Tushita. Later, he also composed a praise to Dorje Shugden that he named Infinite Aeons. This practice, along with many other practices was passed down to Pabongkha Rinpoche who later promoted Vajrayogini’s Tantra and Dorje Shugden practice intensively throughout his teachings.
http://www.dorjeshugden.com/introduction/spiritual-lineage/descended-from-tushita/