Japanese topic: Tenji tenno and Tenmu tenno step-brothers?

[M.Sjostrom]

In a somewhat scandal-mongering-looking style, Mr
Akira Kato offers some points of revised Japanese
history.

Emperor Tenji (originally imperial prince Naga) and
Emperor Tenmu (originally imperial prince Oama) were
monarchs of Great Yamato, or perhaps even most of
Japan, anyway in 600s CE.
Conventional history records them as full brothers,
afaik.

Akira Kato offers, in his other pages, a hint of his
some thoughts - in effect that Tenji and Tenmu were
step-brothers, and thus the unbroken lineage of
Japanese monarchs actually got broken.
Sadly, apparently his thoughts are available only in
Japanese, page
http://barclay.free100.tv/oldhist/temmu.html
(and the English-page link on that page leads to "not
ready - under construction"; apparently there exists
not yet such page in English)

I would like to know what is argumentation and sources
behind this idea, and what these really mean to the
genealogy.

In this step-brother framework, who were biological
parents of imperial prince Naga, known as Tenji tenno
(Emperor Tenchi) ?
That's the most important question.

And, of what quality, reliability and clearness, are
sources and ancient textual passages which support
that parentage information?


----

PS. I have also posed another question about totally
OTHER topic (not medieval) of Japanese genealogy of
the same Yamato clan:
http://members.boardhost.com/Asianroyal ... 79885.html
(if someone happens to know answer to that one, please
reply)



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