Descriptions of spontaneous human combustion date back to the 17th century, with a large number of cases recorded in the 19th century and a handful in the 20th and 21st centuries. Altogether, there are a few hundred recorded possible cases, with only a handful considered to be plausible.
SOURCES
https://www.nps.gov/articles/fire-prevention-52-spontaneous-combustion.htm
https://www.livescience.com/16215-spontaneous-human-combustion-real.html
http://anomalyinfo.com/?q=Topics/spontaneous-human-combustion-brief-history
https://www.baynews9.com/fl/tampa/news/2020/10/20/the-curious-case-of-mary-hardy-reeser
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