THE KARMA KAGYU LINEAGE OF TIBETAN BUDDHISM traces its origins to Shakyamuni Buddha through Marpa the Translator, who traveled to India three times to bring authentic Buddhist teachings back to Tibet. His teacher, the Indian mahasiddha Naropa, received the lineage transmission from Tilopa and so on, back to the Buddha himself. Marpa's most famous student was the greatest yogi in all of Tibet, the renowned Jetsun Milarepa, whose Dharma heir, Gampopa, transmitted the teachings to the First Karmapa, Dusum Khyenpa. Since then, the Kagyu Lineage has been headed by a succession of reincarnations of the Gyalwang Karmapa. The line of the Karmapas is said to be self-announced, because each incarnation leaves a letter predicting his next rebirth. All great Kagyu teachers regard His Holiness Karmapa as the embodiment and source of all of the blessings of the lineage.
For more information - KTC Lineage History Page and KTD Lineage History Page