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Dalai Lama from WikiPedia:

Part of a series on Tibetan Buddhism

During 1252, Kublai Khan granted an audience to Drogön Chögyal Phagpa and Karma Pakshi, the 2nd Karmapa. Karma Pakshi, however, sought the patronage of Möngke Khan. Before his death in 1283, Karma Pakshi wrote a will to protect the established interests of his sect by advising his disciples to locate a boy to inherit the black hat. His instruction was based on the premise that Buddhist ideology is eternal, and a Buddha would send emanations to complete the missions he had initiated. Karma Pakshi's disciples acted in accordance with the will and located the reincarnated boy of their master. The event was the beginning of the teacher reincarnation system for the Black-Hat Line of Tibetan Buddhism. During the Ming Dynasty, Emperor Yongle bestowed the title Great Treasure Prince of Dharma, the first of the three Princes of Dharma, upon the Black-Hat Karmapa. Various sects of Tibetan Buddhism responded to the teacher reincarnation system by creating similar lineages.

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