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"The 6 Shao are MongXi Sao, YueXi Sao, LangQung Sao, DengDan Sao, ShiLang Sao and MongShe Sao. With MongShe being the furtherst south, therefore also called NanShao.
The man who was appoointed as 巍州刺史 WeiZhou governer was 細奴邏 SiNuLuo. But before this, Sinuluo already conqured MonXi and a near by kingdom called Bei. His kingdom besides being NanShao, was also called Mong 大蒙國.
Tang only worked with Nanshao because of the growing Tibetan power."
Precisely because of growing Tubo power, the Tang tried to unite Nan Zhao under one since some tribes of Western Yunnan were submitting to Tubo at times. There are much more than just 6 Zhao, these just happen to be the six large ones in Yunnan, and only really begin to form when the powerful kingdom of Bai Zi is defeated by Tang in 646. Two years later, Nan Zhao incorporated Bai Zi into its domain under the
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command
of Tang.
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"If Tang had "REAL" control over the area, why doesn't Tang just rule Yunnan directly?"
Define this "REAL" control of yours in the first place. Feudal kings do not have "real" control over their feudal lords either, that doesn't mean its not part of their dominion. Feudal lords frequently disobeyed and rebelled against their kings. In fact the Islamic Caliph had little control over the emirs of Spain and also didn't rule it directly. The loose control of the Umayyad eventually led to their overthrow by the Abassids. Spain's American colony is also virtually independent. Even Canada under the British empire was known to make its own decisions, what is your point? All the requirements of control is for the subject to recognize the sovereignty of the sovereign state and for the subject state's foreign policy to be largely controlled by that sovereign state. Nan Zhao fits this category perfectly, expecially when Yunnan was zoned into prefectures and also provided Tang auxiliary troops on multiple occasions against enemies such as Tubo and the other Man.
Furthermore, you need to realize that direct control isn't always the preferred choice, since it would require large sum of budgets to pacify an area whose population were composed of a different ethnic group where turmoil could potentially be frequent. The Jimi prefectures was an ingenious solution to this problem; by turning these states into Tang dominions without exhausting much imperial forces at all.
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"In fact NanShao was never much on the same page with Tang, besides uniting Yunnan. In fact in 742~745, when Tang was advancing into the Eastren Yunan from SiChuan, they requested NanShao to assist in the war against 爨 Cuan tribe. Instead of co-operating, the NanShao asked Tang not to attack"
Your contortions of this issue shows that you obviously never read Yunnan Tong Shi; during early Tang Nan Zhao provided Tang with troops to destroy Bai Zi Kingdom, and the Nan Zhao painting(Nan Zhao Tu Guan mentions the help of the celestial army) depicted this same event. The same is recorded in the source Yunan Tong Shi and Bai Guo Shi Mo. As for the Cuan you ignored the fact that in 739 Tang sent Zu Yin Jin to the Cuan to built a fortification in An Ling which would control the Cuan. The Cuan Ri Jin, Cuan Zong Dao and other groups of Cuan used the slogan of heavy tax and attacked An Ling, killing Zu. Tang immediately counter attacked and sent Sun Xi Zhuan and Li Mi to crush the rebels. At the same time, the emperor ordered Nan Zhao to provide troops. The rebels were defeated, the tribal leaders came to beg forgiveness for their crimes, but Pi Luo Ge was passionate enough to ask Xuan Zong to spare them. And this was done. This doesn't show Tang's lack of control, but Nan Zhao's use of moral which the Tang court accepted. Since the Cuan is well crushed by this time and much of Tang's campaign are simply conducted by greedy generals that want military glory as in the case of Li Mi's execution of the Cuan leaders after they surrendered.
The very unification of Yunnan itself was a Tang strategy. Nan Zhao had to
ask permission from the Tang to carry out the task. And Tang collected tribute from Nan Zhao periodically. The tribes of Yunnan and later the united Nan Zhao kingdom including king Pi Luo Ge had to either visit the court or the headquarter of the Jian Nan Ci Shi.
Far from powerless, the Tang dictates Nan Zhao's actions on most part; only when it came to extreme danger did Nan Zhao finally rebelled with moral and justice on their side against Xian Yu's brazen oppression.
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"After 皮邏閣's death, Tang and Nanshao differed on appointing who to take over the title of 雲南王, and 閣邏鳳 GeLouFong was insulted by 雲南太守張虔陀 Zhang QianTuo. Note that Zhang is only a 太守. If Yunan is a state of Tang, why isn't him 刺史 or a 節度史? 閣邏鳳 GeLouFong killed Zhang while still want to remain a Tang vassal. Since Tang ignore him, he then became Tibet vassal instead."
What exactly is your point? If a mere Tai Shou could already discuss the issue with the king of Yunnan, it is enough to shows Tang's control. There
was a Ci Shi, his name is Xian Yu.
Your arguments are very unclear. Just what part of Zhang's action shows that Yunnan was not part of the Tang? If anything, Guo Luo Feng explicitly mentioned that it was part of Tang.唐所有 Yunnan was a feudal kingdom of the Tang. Thats why its not directly controlled.
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"I think saying being a vassal means this is a independent country, but allied with Tang. So when Tang feels like they can interfere with the internal affair of their vassal states, that always breaks up the alliance."
There is a difference between an inner vassal and an outer vassal. Inner vassals are those that are treated like feudal lords, and Nan Zhao was in fact treated like a feudal lord. The fact was that Tang did interfere with Nan Zhao's internal affair from the beginning to the end. Only when Xian Yu and Zhang Qian Tuo start to make some ridiculous demands, insult the king, meddle with his wife, and worst of all put another contender prince on the throne who was known to be "unfilial and unloyal". But that still didn't force Nan Zhao to rebel. When Guo Luo Feng sent appeal after apeals in vain, he finally killed Zhang. Yet, when Yu Xian sent the Tang army right at the gates of Nan Zhao, Guo Luo Feng again begged forgiveness and only when Tu Xian arrogantly refused since he thought he could easily destroy Nan Zhao did it leave Guo Luo Feng with no option but rebel and ally with Tubo.
Even after his rebellion he still regreted his actions and wrote the Nan Zhao E Hua Bei to describe the reasons he rebelled.
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"In fact Tibet tried the samething in 779. Tibet refused to see NanShao as a equal state, and removed the title of 東帝 (Emporer of the East) and gave a title suggesting NanShao was no longer equal partners. NanShao king 異牟尋 YiMoXuen broke off with Tibet and went for Alliance with Tang again in 794."
Tubo never treated Nan Zhao as an equal in the first place, it was a vassal brother state. Similar to Han and xiongnu. You seem to forget the fact that Tubo ordered Nan Zhao to provide troops almost annually against the Tang and later Uighurs, devastating Nan Zhao's economy and men. Above that is heavy tribute which forces Nan Zhao to again submit to Tang; only this time its more of an alliance and not a subjection. Nan Zhao itself had no strength to stand either Tang or Tubo when it was their vassal. Only under Tubo, Nan Zhao at least initially had the nominal title of brother state and later a vassal kingdom while under Tang it was actually officially zoned into prefectures. And Nan Zhao didn't just break with Tubo, it was a vassal until 792. When Nan Zhao finally did break off, it was only because it had guaranteed Tang assistance since it feared its own strength can't stop Tubo. It allied with Tubo against Tang for similar reasons in 751.
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"However when Tang again refused to title NanShao broke off the alliance."
As I've already stated, the 792 submission IS more of an alliance, but the earlier submission wasn't; it was a feudal submission with Tang controlling Nan Zhao's foreign polices.
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"In fact when you say "Tang set many protectorates in Yunan", I wonder if you know that NanShao copied a lot of Tang systems, therefore they have their own system of protectorates. "
Yes I do, yet I'm talking about the Jimi prefecutres Tang set up nothing else. Nan Zhao set up its own prefectures in the future but again under Tang supervision and acceptance.
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"Tang have protectoratesfor large areas. Why would Tang setup 6 節度 protectorates in Yunnan? NanShao's own 6 節度protectorates are 劍川, 麗水, 銀生, 永昌, 弄棟 and 拓東. Perhaps you were referring to these NanShao protectorates instead of Tang protectorates?"
they are Nan Zhao AND Tang protectorates since Nan Zhao is a feudal kingdom under the Tang.