Padmasambhava

Padmasambhava was the High Lama of Det-Sen Monastery.

He met the Doctor when he visited the monastery in 1630. While traveling on the astral plane, he encountered the Great Intelligence, which took control of him as part of its plan to gain corporeal existence on Earth.

Padmasambhava finally died when the Intelligence was expelled, having lived over 300 years. (DW: The Abominable Snowmen)