Wenzhou dialect is the language of which dynasty?

Analysis of Yonghe, Shun Di (138) in the third year: Dongou Township of Zhang 'an County is located in Yongning County, and Xianzai Township (now Oubei Town of Yongjia County) is governed by the county, which is the beginning of establishing Wenzhou County.

In 323 AD, Yongjia County was established in East Jin Mingdi. The word "Yongjia" means long and beautiful water. While setting up Yongjia County, Guo Pu chose the site to build a city, which is called "Doucheng". Legend has it that when the city was built, a white deer passed by with flowers in its mouth, so it was also called "White Lucheng". In the second year of Shang Yuan in Tang Gaozong (AD 675), it was called Wen for short. Although it is still warm in the middle of winter, it is named Wenzhou.

In addition, I read from some books that Wenzhou City and Yongjia County were originally called Yongjia County. Due to War of Resistance against Japanese Aggression, Yongjia County was divided into Yongjia County (now Wenzhou: Lucheng District, ouhai district District and Longwan District) and Oubei County (now Yongjia County). Yongjia and Yongjia Shangtang area are more orthodox. Wenzhou dialect spoken in Yongjia Shangtang film and Wenzhou Xiacheng film is also the most authentic Wenzhou dialect, and Yongjia dialect is also the oldest. Moreover, Wenzhou City was always the county seat of Yongjia County before it was built-1956, which was under the jurisdiction of Yongjia. Up to now, many people in Wenzhou City have moved from Yongjia County. Therefore, there has always been a saying that "small Wenzhou is big Yongjia County". Yongjia is the originator of Wenzhou.