【Why is the emperor's daughter called "princess"】
The Song "Chronicle of Things" quotes: "The Son of Heaven married a daughter, since the Qin and Han Dynasties, made the three princesses, so call the princess also." "In view of the identity of the Son of Heaven, the daughter is not married, and is presided over by the three dukes, so she is named princess (the "three dukes" of the previous dynasties are not all consistent, such as the Eastern Han Dynasty refers to Taiwei, Situ, and Sikong). The same book quotes the Five Dynasties of the Beginning of the Continuation: "The Son of Heaven of the Han Dynasty... The sister is known as the eldest princess, and the emperor is the eldest princess. "Later generations followed the Ming Dynasty
