I want to know the answer to the following question:
Who was the ruler of China in 677?
All the background I'm provided with is that "They settled in Zhangzhou and brought the Middle Chinese phonology of northern China during the 7th century into Zhangzhou; In 885, (during the reign of Emperor Xizong of Tang), the two brothers Wang Chao (王潮) and Wang Shenzhi (王審知), led a military expedition force to pacify the Huang Chao rebellion.". Is that enough to answer the question?
Answer: no