free imperial city的意思|示意

First mentioned in 854, it was later a free imperial city and reached the height of its influence in the 15th century.

于854年第一次被提到，随后成为一个自由的帝国城市，在15世纪其影响力达到颠峰。

First mentioned in 1050, it became a free imperial city in the 13th century and was a center of the German cultural Renaissance in the 15th and 16th centuries.

1050年第一次被提及，13世纪成为自由的帝国城市，并在15和16世纪成为德国文化复兴中心。