《太平广记·卷四百零八·草木三》
有一个羌人姓姚名馥，字世芬。他在马厩里养马，却懂得阴阳之术。
有羌人姓姚名馥，字世芬，充厩养马，妙解阴阳之术。
There was a Qiang man surnamed Yao and named Fu, whose courtesy name was Shifen. He raised horses in the stables, but he understood the art of yin and yang.