 In 315 the Tuoba chief was granted the title of the Prince of Dai.After the death of its founding prince, Tuoba Yilu, however, the Dai state stagnated and largely remained a partial ally and a partial tributary state to Later Zhao and Former Yan, finally falling to Former Qin in 376.After Former Qin's emperor Fu Jiān was defeated by Jin forces at the Battle of Fei River in his failed bid to unify China, the Former Qin state began to break apart.