The Sixth Dalai Lama didn't keep his vows and "mysteriously" disappeared...
https://en.wikipedia.org/wiki/6th_Dalai_Lama
"Tsangyang Gyatso had always rejected life as a monk, although this did not mean the abdication of his position as the Dalai Lama. Wearing the clothes of a normal layman and preferring to walk than to ride a horse or use the state palanquin, Tsangyang only
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