Qin, known as the Former Qin and Fu Qin (苻秦) in historiography, was a dynastic state of China ruled by the Fu (Pu) clan of the Di peoples during the Sixteen Kingdoms period. Founded in the wake of the Later Zhao dynasty's collapse in 351 AD, it completed the unification of northern China in 376 AD during the reign of Fu Jiān, being the only state out of the Sixteen Kingdoms to achieve this. Its capital was Chang'an up to Fu Jiān's death in 385 AD. The prefix "Former" is used to distinguish it from the Later Qin and Western Qin dynasties that were founded later.