Japanese emperors: came from constantly changing lineages.
The Japanese royal dynasty, whose roots are unknown, based its authority on the assertion that it has "reigned since time immemorial." No records exist of an emperor who is not believed to be a relative of another, earlier ruler.
Although the sources claim that Emperor Keitai (about 500 AD) was a male-line descendant of Emperor jin, here is speculation that he may have been an unrelated outsider. However, records indicate that at least one and perhaps more imperial princesses from the earlier lineage were the ancestors of his offspring, which included his successors.
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