Following his education, and after a short period of training at Leuven Masius worked as secretary for the bishop of Constance, Johannes von Weeze († 13. November 1548).
In 1801, during the turbulent period prior to the dissolution of the old German Empire, he began his career, at the instance of the Prince-Bishop (soon afterwards Prince Primate) Karl Theodor von Dalberg, in the capacity of "publisher to the princely episcopal court of Constance", at Meersburg on the Lake of Constance, the episcopal residence and seat of a seminary.
After 1253 the territory paid tribute and received protection from the Beuron Archabbey, after a change of ownership the Bishopric of Constance, and then the Herren von Enzberg, until it became part of Württemberg in 1805.
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The name was finally fixed as Neunkirch because it belonged to the Bishopric of Constance, whose diocese already included a town called Niuchilchun or Neukirch.