Sima Hui, courtesy name (zi) Decao (德操) and pseudonym (hao) Shuijing (水鏡; literally: "Water Mirror"), was a hermit who lived during the late Han Dynasty. He was from Yingchuan (present-day Yuzhou City, Henan), and lived in northern Jing Province (covering present-day Hubei and Hunan). When he met the warlord Liu Bei, he recommended Zhuge Liang and Pang Tong to be Liu's advisors.
Read more about Sima Hui: Haohao Xiansheng, In Fiction