《太平广记·卷一百三十五·征应一》
隋朝末年有个会看云气的人说： 乾门有天子气，一直连到太原非常旺盛。 
隋末望气者云： 乾门有天子气，连太原甚盛。 
At the end of the Sui Dynasty, there was a diviner who said: “The term of the emperor is in Qianmen, and it extends to Taiyuan, which is very flourishing.”