== No Inline Sources == 

 This article has almost no inline sources, citations, or references. It has a short "Further Reading" list and a few footnotes, but nothing like the detailed and comprehensive list of references in Japanese and English needed to document the assertions in the article. The article is thus a compendium of unsourced and therefore dubious assertions. So I tagged it with {{Original Research}}. Please add references and sources  the Eleventh Edition of the Encyclopedia Britannica is not enough.