In the previous article, "What are the "Sage Khans" of Emperor Wen of Sui inferior to the "Heavenly Khans" of Tang Taizong? It is mentioned that until the fall of the Tang Dynasty, the emperors of the Tang Dynasty inherited the title of "Heavenly Khan" of Tang Taizong, which was far better than the "Sage Khan" of the Sui Dynasty. However, some people wonder that the strength of the Tang Dynasty declined sharply after the "Anshi Rebellion", so why can it retain the honorific title of "Heavenly Khan"?
In the impression of many people, the Tang Dynasty after the "Anshi Rebellion" can be described as a plummet, and it has "survived" for more than 150 years in the midst of internal and external troubles. However, this impression is actually somewhat problematic, and the "Anshi Rebellion" was indeed a heavy blow to the Tang Dynasty, causing the Tang Dynasty to go down to the peak of the prosperous world. However, after more than a decade of recovery, the Tang Dynasty gradually recovered its vitality during the Dezong period, and the external deterrence also recovered.
For example, in the thirteenth year of Emperor Dezong of Tang (797), Ying Ning Jiedu made Yang Chaosheng set up a land of three hundred miles on the border; from the seventeenth year of Zhenyuan (801) to the eighteenth year of Zhenyuan (802), the Tang army broke the main force of the Tubo army through the Battle of Victoria and the Battle of Dulu, and captured Tubo and was reckless. Tubo is the second most powerful regime after the "Anshi Rebellion", which shows that the military strength of the Tang Dynasty is still very strong.
In addition to its strong military strength, the economic strength of the Tang Dynasty was gradually restored during the Tang Dynasty, and the economic development of the south reached an unprecedented level. Therefore, after the "Anshi Rebellion", the Tang Dynasty continued to retain the "Year Grant" given to the surrounding areas (especially the steppe regime) in the name of the "Heavenly Khan", resulting in the surrounding ethnic groups (such as the Uighur Khaganate) also recognizing the "Heavenly Khan" of the Tang Emperor in order to "give the year".
In summary, the Tang Dynasty after the "Anshi Rebellion" achieved "ZTE" after more than ten years of recovery, and still maintained a strong military and economic strength. Although the Tang Dynasty at this time could not be compared with the Sheng Tang before the "Anshi Rebellion", it was still able to barely retain the honorific title of "Heavenly Khan" until the fall of the Tang Dynasty.