What is the official language of ancient times?

Yes, there was a saying of "elegance" in the pre-Qin period. The ancients in China attached great importance to the unification of dialects all over the country, so "Ya Yan" appeared. Yayan is the earliest ancient lingua franca in China, which is equivalent to Mandarin in meaning. Its phonology is archaic, and so far no dialect has completely corresponded to it. Elegant speech reached its peak in the Tang and Song Dynasties, reaching a word, and a large number of works of Tang poetry and Song poetry emerged, and neighboring countries rushed to learn from Luoyang elegant speech. Mandarin with Luoyang dialect as the standard pronunciation lasted for more than 4,000 years, and North Korea, South Korea, Vietnam and Japan were all affected. In the Qing Dynasty, there were also mandarin mainly in Beijing dialect.