Sokushinbutsu

Sokushinbutsu were Buddhist monks or priests who  allegedly caused their own deaths in a way that resulted in their being mummified. This practice reportedly took place almost exclusively in northern Japan around the Yamagata Prefecture. Between 16 and 24 such mummifications have been discovered.

Other notable examples include Dashi-Dorzho Itigilov in Siberia, Loung Pordaeng in Thailand, and a 15th-century Tibetan monk from Northern India examined by Victor Mair in the documentary "The Mystery of the Tibetan Mummy".

The practice was satirized in the story "The Destiny That Spanned Two Lifetimes" by Ueda Akinari, in which such a monk was found centuries later and resuscitated. The story appears in the collection Harusame Monogatari.