"The Kagyud Tradition developed from the teachings of Naropa and Maitrepa. The main founders of all the sects of the Kagyud are the three Great Masters: Marpa, Milarepa and Gampopa. From these three Masters the Kagyud Lineage scattered into the four major and eight minor Lineages. It was from Gampopa's disciple, Phagmo Drupa that most of these lineages of the Kagyud Tradition came, spreading in many different directions. Presently there are four which have not faded and still exist: the Karma Kagyud, Drukpa Kagyud, Drigung Kagyud and Taglung Kagyud. The Dharma lineages of the others have become very subtle or thin (having mostly been absorbed into larger lineages)."
Painted Images of Enlightenment: Early Tibetan Thankas, 1050-1450. Steven Kossak. Marg Publications, 2010.
Sacred Visions: Early Paintings from Central Tibet by Steven M. Kossak and Jane Casey Singer With an essay by Robert Bruce-Gardner. The Metropolitan Museum of Art, New York, 1998. (Book Review Video).