this flag dates back to the XIII century, since the Mongol invasion of Japan. The flag was offered to the Japanese emperor, considered a descendant of the Sun goddess, by Buddhist monks.
The flag began to be considered as a state flag in the era of national restoration after 1868.
Officially in Japan, the flag is called "Nisseki", "solar flag", but the more common variant is "Hinomaru", "solar disk".
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