St. Bruno of Cologne (I've always wondered why we translate Köln to Cologne). Born in Köln, became a priest, professor of theology in Rheims (Pope Urban II was one of his students), founded the Carthusian Order (one of the most austere monastic orders, said to nunquam reformata quia nunquam deformata, which translates to never needed reform because the were never deformed. Rhymes in English and Latin), and was counselor to Pope Urban II (who was one of his students in Rheims). He is a patron of diabolically possessed people. Today his feast falls on both calenders of the Roman rite.
Sanctus Bruno, ora pro nobis