That originated from the naming rules given to future generations by Zhu Yuanzhang, the founding emperor of the Ming Dynasty. Zhu Yuanzhang considered that names might be repeated as his descendants multiplied, so he personally formulated the principles and methods for naming his descendants. Naming was based on the "generation line" rule. He drafted 20 characters for each of his 24 sons' descendants, and each character represented one life. When a descendant is born, the clan will give him a double name according to the order of his birth. The first character in the double name is the one given by Taizu, and the second character must be a character with the five elements as its radical. The five elements are "fire, earth". ", metal, water, wood" is the order, such as "fire" is the radical used by Zhu Yuanzhang to name his grandchildren. Among the sects chosen by Zhu Yuanzhang for his 24 grandsons, the sect of the descendants of the eldest landlord, Gong Yiwen and Prince Zhu Biao, is: "Yunwen obeys the instructions of his ancestors, the emperor of Qinwu wins, it is good to follow the road, and the teacher is good and makes good use of Sheng." The fourth room of Prince Yan's Mansion, which later became the Ming Dynasty's imperial line, is the descendant lineage of Zhu Di: "Gaozhan Qijian (right), Hou Zaiyi Changyou, Cihe Yibocu, Jian Jingdi Xianyou." Emperor Wen Zhu Yun (Huo Wen) was the eldest son of Zhu Yuanzhang, who was born in the "Yun" generation and had a "Fire" character. Another example is the last emperor Chongzhen Zhu Youjian, who was the tenth generation of the fourth family, and belonged to the generation with the character "You" and the character "Wood". After Zhu Yuanzhang, the first emperor of the Ming Dynasty, ascended the throne in the first year of Hongwu (1368), he implemented the system of princes conferring kingships to consolidate the Ming Dynasty.