In the sentence in "The Peach Blossom Fan": "Emperor Gao, go to Jiujing..." The "Emperor Gao" in which emperor is of which dynasty?

Original text: "The Peach Blossom Fan·Crying Lord" by Kong Shangren of the Qing Dynasty: "When Emperor Gao was in Jiujing, he didn't care whether his family was dead or his family was ruined, but his holy son and grandson would be better off with their branches cut off." I rather agree. It's Zhu Yuanzhang. Because Zhu Yuanzhang was the Taizu of the Ming Dynasty and was called Emperor Gao, this was the first thing to get the right title. Secondly, after Zhu Yuanzhang died, Zhu Di turned against the emperor and forced his nephew Zhu Yunwen away. Zhu Yuanzhang struggled to support the emperor's grandson and expected him to inherit the country, but he was snatched away by his ambitious son. This is exactly the same as the sentence in the article, “It’s better to know that his holy son and grandson are worse than being cut off.” There are also some elders from the old Ming Dynasty who refused to submit to the jurisdiction of the Qing Dynasty and mourned the past events of the previous Ming Dynasty. Finally, literati have a habit of writing articles. They like to use the past to satirize the present. For example, Bai Juyi used "The Emperor of the Han Dynasty focused on color and thought of the country" to allude to Xuanzong of the Tang Dynasty. This is both literary beauty and taboo. Here he uses the term "Ming Dynasty" As far as today's things are concerned, of course there is no problem.