Ngô Sĩ Liên
The books (from the 15th century) and ("Wonders plucked from the dust of Linh-nam", from the 14th century) mention the legend with Âu Cơ. Ngô Sĩ Liên commented on the somewhat primitive nature of the relationship between the two progenitors, given that Lạc's father Kinh Dương Vương and Âu's grandfather Đế Nghi were brothers.