Rieul of Reims was a Benedictine priest who served as the Bishop of Reims from 673 until approximately 689. During his tenure, he acted as an ally to Ebroin and participated in the council of bishops at Marly to judge Leger. His political involvement led to a significant confrontation with the Austrasian Dukes, Martin and Pepin of Herstal, following their defeat at the Battle of Lucofao.