I really doubt the ancestry claims of Tang emperors. From books we know that the Tang and Sui aristocrat are the military elites of six counties 北魏六镇。They have a lot of maternal genes input from Xianbei. Not only Dugu 独孤, but also 长孙. Their elites like 宇文, 拓跋 (元
, are all Xianbei.
Since you pointed out their paternal genes are different from Mongols and Turks, I would need to do more research.
The most authoritative scholar on genetic distance is Luigi Luca Cavalli-Sforza of Stanford University. Cavalli-Sforza's The History and Geography of Human Genes (1994 with Paolo Menozzi and Alberto Piazza) is a standard reference on human genetic variation.
I wonder why he group S Chinese together with Malay, viet, hmong.....etc Is it because our mother side genes are too strongly Yue?
Northern Chinese is group with Japs, Korean, Mongols and Turks.
I think Cavalli Sforza is not dealing with Y chromosome DNA. He probably tested autosomal DNA (the entire DNA in a persons genome). In Chinese culture, descent is traced through the father.
If a couple of northern Chinese men moved to southern China and their descendants keep marrying Yue women, eventually their entire autosomal DNA will became like Yue, only their y chromosome will remain Han like northern Chinese.
The genetic studies I showed you said that northern and southern Chinese have the same Y chromosome DNA and diffent mitochondrial DNA. The paternal lineage is the same and the maternal lineage is different.
This is the family tree of the Tang Emperors starting from Laozi and ending with the first Tang Emperor.
李耳,老子
李宗,楚國苦縣人,字尊祖,魏國木大夫.
李同,趙國大將軍.
李兌,趙國丞相.
李躋,趙國陽安君.
李恪,字道弘,秦國太子太傅.
李興族,字育神,一名汪,秦國將軍.
李曇,字貴遠,趙國柏人縣侯,入秦國為御史大夫.
李崇,字伯,隴西郡太守,南鄭公.(注:隴西李氏房系始于此
李平瑤,字內德,南郡太守,狄道侯.
李信,字有成,大將軍,隴西侯.
李超,一名伉,字仁高,漢大將軍,漁陽郡太守.
李仲翔,河東郡太守,征西將軍.
李伯考,隴西,河東二郡太守.
李尚,成紀縣令.
李廣,前將軍.
李敢,字幼卿,郎中令,關內侯.
李禹,字子通.
李丞公,字丞公,河南郡太守.
李先,字敬宗,蜀,北平二郡太守.
李長宗,字伯禮,漁陽郡丞.
李君況,字叔,一字子期,博士,議郎,太中大夫.
李本,字上明,郎中,侍御史.
李次公,字仲君,巴郡太守,西夷校尉.
李軌,字文逸,三國魏臨淮郡太守,司農卿.
李隆,字彥緒,長安令,積弩將軍.
李艾,字世績,西晉驍騎將軍,魏郡太守.
李雍,字俊熙,濟北,東莞二郡太守.
李弇,字季子,前涼張駿天水郡太守,武衛將軍,安西亭侯.
李昶,字仲堅,前涼太子侍講.
李暠,字玄盛,西涼武昭王,興聖皇帝.
李歆,字士業,西涼後主.
李重耳,字景順,以國亡奔宋,為汝南郡太守.北魏克豫州,以地歸之,拜恒農郡太守,複為宋將薛安都所陷,北魏安南將軍,豫州刺史.
李熙,字孟良,北魏金門鎮將.(唐獻祖
李天賜,字德真.(唐懿祖
李虎,字文彬,北周柱國大將軍,唐國襄公.(唐太祖
李昺,北周安州總管,柱國大將軍,唐國仁公.(唐代祖
李淵,生於長安,唐高祖
The northwest aristocracy was indeed mixed with nomadic peoples like the Xianbei and others. But the Tang and Sui Emperors were adamant that their paternal lineage is from Han Chinese. The Tang emperors gave titles to Laozi as their ancestor.
The Encyclopedia of Taoism: 2-volume set - Google Books
Finding Wisdom in East Asian Classics - Google Books
Opusculum de Sectis Apud Sinenses Et Tunkinenses - Adriano (di St. Thecla) - Google Books
China: A Global Studies Handbook - Robert André LaFleur - Google Books
Historical Dictionary Of Medieval China - Victor Cunrui Xiong - Google Books
The Origins of Political Order: From Prehuman Times to the French Revolution - Francis Fukuyama - Google Books
The Kaghan of the Yenisei Kirghiz claimed to be descended from the Han dynasty Chinese General Li Ling. LinLing defected to the Xiongnu and married the Xiongnu Chanyu's daughter. He was sent by the Chanyu to govern the place where the ancestors of the Yenisei Kirghiz lived. Li Ling was a grandson of Li Guang. The Tang Emperors were also descended from Li Guang through another grandson.
The Kirghiz Kaghans mentioned this relation with the Tang dynasty and then they became allies. They helped the Tang destroy the Uyghur Khaganate (who are not related to the modern Uyghurs).