The Atisha reference article from the English Wikipedia on 24-Jul-2004
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Atisha

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Atisha is the teacher who brought the Mind Training teaching from Sumatra to India and then transmitted it to Tibet.

He was born in India in 982 CE. He was first initiated into, and became an adept in, the esoteric and magical practices of Tantra, which were very popular in India at the time, and supposedly caused the end of Indian Buddhism.