What was the cause of death of XXX?
Cheng Rui
Cheng Rui (成汭) (d. June 10, 903), adoptive name Guo Yu (郭禹) (used until ~888), formally the Prince of Shanggu (上谷王), was a warlord late in the Chinese dynasty Tang Dynasty who ruled Jingnan Circuit (荊南, headquartered in modern Jingzhou, Hubei) from 888 to 903, when he was defeated in battle and committed suicide.
suicide