Provide the name, governing ideology, technological advancement level, government style and quality of life for a post-618 AD, pre-907 AD Mongol-Manchurian Imperial House of Li-ruled absolute imperial dynastic monarchy of the Great Tang Empire/"Tang dynasty" ruling over Han China from [the Great Tang Empire's stronghold and base] East Turkestan and the Hui-dominated Central China which [the Great Tang Empire/"Tang dynasty" in this timeline] migrated from the eighteen provinces of Han China proper after its [the Great Tang Empire's/"Tang dynasty"'s] fall and [the Great Tang Empire/"Tang dynasty" after leaving the China region in this timeline] migrated to the land of Yamato [Great Yamato |Yamato|, ancient, pre-shogunate Japan, |Yamato|, which |Yamato| consisted of the Japanese Home Islands, the entire Korean peninsula and Russia's Sakhalin and Kurils Islands along with some parts of Cantonia |Guangdong and Guangxi|], [the Great Tang Empire's/"Tang dynasty after migrating to Yamato in this timeline] quickly conquering it [Yamato in this timeline] and the descendants of the Imperial House of Li intermarrying into what would become the real-life Japanese imperial family, the supposedly Shinto Gods-descended Japanese Imperial House of Yamato as Tang-conquered Yamato in this timeline became a stronghold from which the Tang hoped to reconquer China, although this quickly faded away as the Tang dynasty was quickly absorbed into what would become Nihon/Nippon [the Land of the Rising Sun/Japan |Nihon/Nippon|] and became a separate state from mainland China once again, although the nobility, aristocracy and royalty of this new Tang-Yamato almagam state continued speaking in Manchu, Mongolian and Chinese and writing in said language. 

This version of Japan views itself as the "true China" and the state with the eternal Mandate of Heaven in contrast to the ever-lasting cycles of dynasties and empires in the China region. The influx of advanced technologies, military might and cultural and religious development from the Tang and Japan's indigenous culture and religion lead to a potent mix that made it the strongest naval power in the region. 

This version of Japan still has the first shogunate formed in it on Aug 21, 1192

Japan also never lost the Korean peninsula to the ethnic Korean general Yi-Seong-Gye, who [Seong-Gye] formed the Joeson Kingdom in real life due to Seong-Gye being killed on the transition from the Mongol Empire splinter state of the Yuan dynasty to the Ming dynasty.

 The Ming still exists but with Japan maintaining control over Korea, the Ming and this version of Japan engage in a cold war until the Jurchen tribes of Manchuria conquer the Ming and establish the Great Qing Empire in 1662. 

The Ming and later the Qing dominate the land of the China region with this form of Japan dominating the seas. The Cantonese and the Han still resist the Manchus and the Qing and launch rebellions against both and Japan still has the Meiji restoration in 1868, but the shogunate system is not removed in Japan, instead the Japanese imperial family regains its power while the shoguns run Japanese local government. 

The Xinhai Revolution of 1912 still topples the Qing and puts the Beiyang Government-ruled first Republic of China as the government of China, however the Beiyang Government remains true to its goal of being a regency for the restoration of the Ming and the Ming is restored as the government of China. Japan takes Manchuria as a protectorate along with Greater Mongolia during the Xinhai Revolution. 

The Ming being restored after the Xinhai Revolution prevents the modern warlord era and thus the Second Sino-Japanese War, and so the Beiyang Government and Japan last until the later half of the 20th century and beyond. 



The name should be in romanized Japanese with translations. This is for an alternate history fanfic where this version of Japan replaces Brittania from Code Geass