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Catholic Encyclopedia
http://www.newadvent.org/cathen/04751a.htm
St. Desiderius of Cahors, bishop of that city, promoted monasticism, d. 655.
For All the Saints
http://www.saintpatrickdc.org/ss/1115.htm#didi
Very brief paragraph on St. Desiderius of Cahors, also known as St. Didier.