孫權屬下太史慈的同鄉、部將。他與曹操部下守備合肥的張遼手下養馬後槽是弟兄。戈定奉太史慈之命潛入合肥，太史慈讓他在馬廄放火，應外合攻破城池殺掉張遼。張遼冷靜沉着應對，識破戈定計謀，李典擒獲戈定兄弟。張遼詢問得知實情，立斬戈定於馬前。張遼設計引誘太史慈，太史慈負重傷，回營死去[1]。
參考文獻
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