Saint Caraunus of Chartres (or Caranus, Caro, Chéron) was a 1st or 5th century Christian missionary in Gaul who was murdered by robbers.

He was assigned by King Brenn of the Carnutes to a group of three priests sent by Saint Denis to evangelize the south of the Île-de-France.

Near Chartres he found a small group of Christians descended from the converts of Saints Potentianus and Altinus.

[4] The hagiographer Alban Butler (1710–1773) wrote in his Lives of the Fathers, Martyrs, and Other Principal Saints under May 28, St. Caraunus, called also Caranus, and Caro, in French Cheron, M. He was a native of Gaul, and flourished towards the end of the fifth age.

After the death of his parents, who were Christians, he distributed all his substance to the poor; and, in order to serve God with more ease, retired into a desert, where the bishop of the place, discovering his merit, ordained him a deacon.

[5] He then determined to consecrate himself entirely to the ministry of the word; and having preached in several provinces of Gaul,[a] he came into the territory of Chartrain, where he found but a small number of Christians, the descendants of those who had been formerly converted by St. Potentianus and St.

[7] His disciples buried his body near Chartres, upon an eminence which was since called the holy mount; and after some time a church was erected there under his invocation, the care of which was entrusted to a community of ecclesiastics; but the canon regulars were substituted in their room in 1137.

The president of Lamoignon obtained one bone of them in 1681, for the church which is dedicated to the saint at Mont-couronne, one of the parishes of Baville.