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Lieutenant General
Well for you who is interested in the origin of Japanese I finally found the Korean Author his name is Wontak Hong He used to have website but it is gone now But he publish his finding make a fascinating reading of Ancient Korea, Japan, China. He draw much of his work from Samkuk Sagi which in return draw much from the History of Wei. But Akihito did acknowledge his Korean ancestry in 2001

In 2001, Emperor
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told reporters "I, on my part, feel a certain kinship with Korea, given the fact that it is recorded in the Chronicles of Japan that the mother of Emperor Kammu [Niigasa] was of the line of
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." It was the first time that a Japanese emperor publicly acknowledged Korean blood in the imperial line.
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According to the
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, Niigasa is a descendant of
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, son of Muryeong, who died in Japan in 513 (
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Chapter 17).

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Registered Member
I should add to the fact that the original layer of Chinese words first imported to the Japanese language were of the Wu dialect, once again, which are the people that settled in the Yangtze delta. Hence they are referred to as Go-on. Chinese words that were imported from the Tang Dynasty are referred to as Kan-on. An example of a Go-on reading is Nin for 人, which is Jin in Kan-on, and Ren in Mandarin.
I think you confused the "Wu dialect" with southern Mandarin in Nanjing (then Jiankang).

Go-on (吴音) was imported to Japan during the time of southern and northern dynasties before the Tang. This 吴音 is the speech in the capital Jiankang. The speech is primarily Mandarin (northern dialect) brought by the East Jin dynasty from Luoyang. It mixed some local dialect but it is not southern dialect. The Wu dialect on the other hand is the speech of the native local around Jiankang, this dialect is not possible for northerner to understand. So the 吴音 in Japanese context is Mandarin Chinese from Jiankang (Nanjing), 吴方言(wu dialect) in your post is another different dialect.

This phenomenon is still present today. The Nanjing speech is pretty much Mandarin with some southern accent, it is not a southern dialect spoken by the population around Nanjing. The same is true in Hangzhou and Chengdu, both were once filled by northern refugee dynasties (Southern Song, and Shu Han). I have a friend who is born 40km outside of Hangzhou, his dialect is totally different from Hangzhou, I could not understand a single word from him, but I had no problem in Hangzhou.
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Did you read the papers (and others like it)? It suggests the language of the Yayoi displaced the Jomon language, because the Yayoi were richer and more technologically advanced.

Yayoi linked to Yangtze area
DNA tests reveal similarities to early wet-rice farmers

The Japan Times, March 19, 1999

Some of the first wet-rice farmers in Japan might have migrated from the lower basin of China's Yangtze River more than 2,000 years ago, Japanese and Chinese researchers said Thursday.

This was suggested by DNA tests conducted by the researchers that showed genetic similarities between human remains from the Yayoi Period found in southwestern Japan and the early Han Dynasty found in China's central Jiangsu Province, Satoshi Yamaguchi told reporters.

People who introduced irrigation techniques to the Japanese archipelago in the Yayoi Period (250 B.C.-300) were believed to have come to Japan either from the Korean Peninsula across the Tsushima Strait, or from northern China across the Yellow Sea.
The latest findings, however, bolster another theory suggesting the origin of the Yayoi people was an area south of the Yangtze, which is believed to be the birthplace of irrigated rice cultivation.

Yamaguchi, a researcher at Japan's National Science Museum, said the researchers compared Yayoi remains found in Yamaguchi and Fukuoka prefectures with those from early Han (202 B.C.-8) in Jiangsu in a three-year project begun in 1996.

The researchers found many similarities between the skulls and limbs of Yayoi people and the Jiangsu remains.

Two Jiangsu skulls showed spots where the front teeth had been pulled, a practice common in Japan in the Yayoi and preceding Jomon Period.

But the most persuasive findings resulted from tests revealing that genetic samples from three of 36 Jiangsu skeletons also matched part of the DNA base arrangements of samples from the Yayoi remains, the scientists said.

Have you guys never heard of Xu Fu?