Saint Ivo of Chartres (also Ives, Yves, or Yvo; Latin: Ivonis Carnutensis) (c. 1040 – 23 December 1115) was the Bishop of Chartres, France from 1090 until his death, and an important canonist during the Investiture Crisis.
Ivo is claimed to have studied at the Abbey of Bec in Normandy under Lanfranc of Canterbury, where he would have met St. Anselm of Canterbury, the great scholastic theologian. In 1067 or not much later, he became, at the desire of his bishop, prior of the canons of Saint-Quentin at Beauvais. As Bishop of Chartres and a canonist he contended strongly against simony and opposed King Philip I of France's repudiation of his wife Bertha of Holland in order to marry Bertrade of Anjou in 1092. Ivo was briefly imprisoned for this opposition.
Three extensive canonical works, namely Tripartita, Decretum, and Panormia, are attributed to him. He corresponded extensively. His liturgical feast has been kept since 1570 on 20 or 23 May, and it is observed on 23 May. It is not known whether or when he was canonized.
Chartres (French pronunciation: [ʃaʁtʁ]) is a commune and capital of the Eure-et-Loir department in France. It is located 96 km (60 mi) southwest of Paris. This city is well known for its cathedral.
Chartres was in Gaul one of the principal towns of the Carnutes, a Celtic tribe. In the Gallo-Roman period, it was called Autricum, name derived from the river Autura (Eure), and afterwards civitas Carnutum, "city of the Carnutes", from which Chartres got its name. The city was burned by the Normans in 858, and unsuccessfully besieged by them in 911.
During the Middle Ages, it was the most important town of the Beauce. It gave its name to a countship which was held by the counts of Blois, and the counts of Champagne, and afterwards by the House of Châtillon, a member of which sold it to the Crown in 1286.
In 1417, during the Hundred Years' War, Chartres fell into the hands of the English, from whom it was recovered in 1432.
In 1528, it was raised to the rank of a duchy by Francis I.
Chartres is a city in Eure-et-Loir, France. "Chartres" may have other meanings.