Ivo of Chartres was a prominent 11th-century French cleric, jurist, and bishop. Born around 1040, he served as the provost of the Collegiate Church of Saint-Quentin, where he introduced the Rule of St. Augustine, and later became the Bishop of Chartres in 1090. A highly respected scholar of canon law, he was a significant figure during the Investiture Crisis. His legal expertise and emphasis on moderation and charity made him a leading authority in medieval ecclesiastical law, influencing many subsequent legal collections and thinkers.