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Tang Ruizong Li Dan is Tang GaozongLi ZhiThe youngest son,Wu ZetianHis fourth son was born in Hanliang Hall of Chang'an City on June 1, the second year of Longshuo, and was granted the title of King Yan in November that year.Later, they were successively named King Yu, King Ji, and King Xiang.Ruizong was called "Xulun" at first, and then he went to Xulun to be called "Lun".Yi Feng moved to Luoyang for three years and changed his name to Dan.
