The most serious rivals to the Tang Empire were the

Question

Quizplus · Accepted Answer

The Uigurs and Tibetans were both powerful rivals to the Tang Empire during the 8th and 9th centuries. The Uigurs, a Turkic tribe, had briefly allied with the Tang Empire but later rebelled and established an independent kingdom in the northwestern region of China. The Tibetans, who controlled a large part of the Tibetan plateau, frequently raided Chinese territories and even briefly captured the Tang capital of Chang'an in 763 CE. While the Arabs and Japanese did have some interactions with the Tang Empire, they were not considered as serious rivals compared to the Uigurs and Tibetans. The other options, such as Mongols, Berbers, Vikings, Huns, Russians, and Koreans, were not significant players during the Tang era.

The Most Serious Rivals to the Tang Empire Were the