生平
后赵时,中谒者令申扁被石虎宠幸,石宣也和他关系亲昵。申扁聪辩明断,管理机密之任。石虎不理政事,石宣荒淫酗酒,石韬沈湎打猎,生杀除拜都是申扁所决定。权倾内外,刺史二千石多出其门,九卿已下望尘而拜,只有侍中郑系、王谟、常侍卢谌、崔约等十余人与他抗礼。后赵灭亡后,郑系转任洛州刺史。351年八月,魏国徐州刺史周成、兖州刺史魏统、荆州刺史乐弘、豫州刺史张遇投降东晋,献出了他们所占据的廪丘、许昌等地。平南将军高崇、征虏将军吕护挟持着郑系也投降东晋。
参考资料
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