Ibbenbüren is said in documentary evidence for the first time in 1146, when the bishop of Osnabrück at that time, Philipp of Katzenelnbogen, donated a tenth of his possessions in Ibbenbüren to the Getrudenkloster of Osnabrück. Although Ibbenbüren is already much older and a document of the year 1348 already occupies the establishment of a church in the year 799, the year 1146 is officially considered as the year of the foundation of Ibbenbüren.