阴山
The ancestral home of the Tuoba Xianbei was the Greater Khingan range of Inner Mongolia. In 258, the clan migrated south to the Yin Mountains and spread into the Ordos Loop region. In 315, chief Tuoba Yilu was recognized as the Prince of Dai by the Jin Emperor. In 338, Tuoba Shiyijian formally declared Dai's independence and built the capital at Shengle (modern day Horinger County, Hohhot). In 376, the Former Qin attacked Shengle and drove the Tuoba into the northern steppes; Tuoba Shiyijian was killed by his son.