Some annals in the Ming dynasty, for example Dian Lüe (滇略) and Yunnan General Annals (云南通志), support this.[1] However, modern historian Tan Qixiang states that this theory is a superficial explanation of the literal meaning.[2] Another common theory is that the name means "south of Yun Range" (云岭之南) However, this has been disproven because the name "Yunling Mountains" first appeared in Tang dynasty (618-907) literature, but the name "Yunnan" first appeared during the Han dynasty (202 BC–220 AD).[14] Modern research gives more conjectures.