The horse on which the Eastern Jin Marshal Zhao Gu was riding died suddenly, and the general let out a melancholy sigh. A guest arrived, and the clerks did not dare to inform him. Guo Pu came to his gate, and announced: “I can save this horse.” The general thus summoned him for an audience. Pu ordered that thirty people should all hold long poles, and go east for thirty li, reaching a grave mound and a forest attached to an altar to the god of the land. They then dispersed and beat the area, at which they captured an ape-like beast, which they then carried back. When it came before the horse, the beast sniffed at it, and the horse arose as if to leap up. To this day macaques are placed in stables, for this very reason.
Li Rong 李冗, Du yi zhi, 獨異志 (Outstanding Fantastic Stories), 上1.18 (Tale 87):
Li Rong 李冗, Du yi zhi, 獨異志 (Outstanding Fantastic Stories) in Du yi zhi, Xuanshi Zhi 獨異志，宣室志 (Outstanding Fantastic Stories, Stories from the Chamber of Dissemination), edited by Zhang Yongqin 张永钦 and Hou Zhiming 侯志明 (Beijing: Zhonghua shuju, 1983)