When Zhao Yun's mother gave birth to him, his father hoped that he would become a great person like a dragon. Just when his mother was pregnant, lightning and thunder outside the window occurred. Zhao Yun's uncle had a dream (he was asleep when Zhao Yun was born) that a giant dragon entered the ground, which coincided with Zhao Yun's birth, so he named him Zhao Zilong (the son of heaven, a giant dragon, called Zilong)