(also Ives, Yves, or Yvo; Latin: Ivo Carnutensis; c. 1040 – 23 December 1115), was a French canon regular and abbot who then served as the Bishop of Chartres from 1090 until his death.

[7] In light of the events preceding his appointment to the office, his strong opposition to the practice of simony may have been the impetus to his episcopal elevation.

During his twenty-five year episcopacy at Chartres, Ivo was involved in conflicts with many magnates including King Philip I of France, Archbishop Richer of Sens, the papal legate Hugh of Die, and several local nobles.

The most famous case concerned the marriage of King Philip, who in the early 1090s tried to repudiate his wife Bertha of Holland in order to marry Bertrade of Anjou.

[7] Local baron Hugh Le Puiset took advantage of the situation to seize episcopal lands and imprison the bishop for a short time.

In addition, on several occasions he defended her decisions, most notably during the events regarding Rotrou III of Perche, when he refused to assert ecclesiastical sanctions against him.

[9] During his episcopacy Ivo wrote the majority of his extant works, for which he later became famous and considered among the greatest scholars of the mediaeval era.

The Prologue to the Decretum deals with the interpretation of canon law, and specifically argues that caritas was the solution for sin, and not harsh punishment without contrition.

[11] For example, Gratian’s Concordia Discordantium Canonum (commonly denominated Decretum Gratiani) draws on both the Tripartita and the Panormia.