Later Qin

Qin, known in historiography as the Later Qin (simplified Chinese: 后秦; traditional Chinese: 後秦; pinyin: Hòuqín; 384–417 AD) or Yao Qin (姚秦), was a dynastic state of China ruled by the Yao clan of Qiang ethnicity during the Sixteen Kingdoms period in northern China. As the only Qiang-led state among the Sixteen Kingdoms, it was most known for its propagation of Buddhism under its second ruler, Yao Xing, who sponsored the Madhyamakin monk, Kumārajīva to translate Sanskrit Buddhist text into Chinese. All rulers of the Later Qin declared themselves emperors, but for a substantial part of Yao Xing's reign, he used the title Heavenly King. Historiographers gave the state the prefix of "Later" to distinguish it with the Former Qin and Western Qin as it was founded during the Former Qin's collapse after the Battle of Fei River and went on to conquer the Former Qin's power base in the Guanzhong. With Chang'an as its capital, the Later Qin also controlled Henan and vassalised the Western Qin, the four Liangs (Later, Southern, Northern and Western), Southern Yan, Qiao Shu, Chouchi and various tribes of the Ordos region.