Nanjing was the name for Beijing during the Liao dynasty, when Khitan rulers made the city the southern capital. To distinguish Nanjing, which literally means "South Capital" in Chinese, from modern Nanjing in Jiangsu Province, Chinese historians sometimes refer to Beijing during the Liao dynasty as Liao Nanjing . The Khitan rulers of the Liao acquired the city, then known as Youzhou, in the cession of the Sixteen Prefectures in 938 from the Later Jin, and the city was officially renamed Nanjing, Youdu Fu (南京幽都府). In 1012, the city was renamed Nanjing, Xijin Fu (南京析津府). The city was also colloquially referred to at the time as Yanjing. In 1122, the city was captured by the Jurchen Jin dynasty and was officially renamed Yanjing, ending the use of Nanjing for what is today modern Beijing.