The imperial house of Japan is the longest hereditary monarchy in the World with traditionally 125 monarchs in succession and counting since Emperor Jimmu in 711 BC. According to legend, Jimmu directly descended from the sun goddess Amaterasu and founded Japan.
However, the first 28 emperors (including Jimmu) likely never existed and might only be part of Japanese folklore. The first verifiable emperor is Emperor Kinmei (509-571) and the tradition is continued to this day with Emperor Akihito (b.1933). Well, 1500 years is still very impressive.
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Photo Credits / Sources:
By Ginko Adachi (active 1874-1897) (artelino – Japanese Prints – Archive 29th May 2009) [Public domain], via Wikimedia Commons