《魏书·列传·卷八十三》
刘渊到达左国城，刘宣等人就给他进上大单于的称号，二十天之内，就集合部众五万人，在离石建立国都。
渊至左国城，刘宣等上大单于之号，二旬之间，众便五万，都于离石。
When Liu Yuan arrived at Zuoguo City, Liu Xuan and others gave him the title of Great Chanyu. Within 20 days, he gathered 50,000 troops and established a capital in Lishi.