IVO OF CHARTRES, SAINT (Yvo, YvEs) (c. 1040 I116), bishop of Chartres, was born of a noble family near Beau vais, and was educated in Paris and at Bec under Lanfranc. About Io8o he became prior of the canons of St. Quentin in Beauvais and ten years later bishop of Chartres in place of Geof frey who had been deposed for simony. As bishop he incurred the hostility of Philip I. who wished to leave his wife and marry the Countess Bertrada of Anjou. In the Investiture struggle his policy was one of moderation. His importance as a canonist is apparent from his Decretum and his Panormia, both composed before 1096. His 288 letters throw much light on the political, religious and liturgical questions of his day. In addition to these
works, which together with the sermons are printed in Migne's Patrol. Lat., vols. 161 and 162, No wrote an unprinted commen tary on the Psalms and a collection of canons, Tripartita. His feast is celebrated on May 20.