Mainz Stift Feud, 1461-1463

In 1459, Dieter von Isenburg had been elected Archbishop of Mainz, by the Cathedral Chapter; Pope Pius II. did not recognize him, and in an unusual procedure, banned Dieter von Isenburg (August 21st 1461) and appointed Adolf II. von Nassau. Cathedral chapter as well as the city of Mainz supported Dieter von Isenburg. Both candidates rallied forces; Adolf von Nassau in 1462 took the city of Mainz, which was deprived of her status as an immediate or free Imperial city and was incorporated into the princebishopric.
On October 5th 1463 peace was concluded by the Treaty of Zeilsheim. Adolf II. von Nassau prevailed; upon his death in 1475, Dieter von Isenburg again was elected bishop, and this time recognized by Pope Sixtus IV. The Mainz Stift Feud resulted in territorial loss of the princebishopric, as both candidates attempted to rally support by giving away territory of the princebishopric.
The Mainz Stift Feud occurred at a time, when both the authority of the (restored Roman) papacy, as well of Emperor Frederick III., was little recognized in large regions of the Holy Roman Empire.

Article Dietherr Graf von Isenburg, from BBKL, in German
Article Adolf II. Graf von Nassau, from BBKL, in German
Geschichte des Domkapitels zu Mainz (History of Mainz Cathedral Chapter), from Bistum Mainz, in German
DOCUMENTS Deutschsprachige Fragmente im Staatsarchiv Marburg, has two Hessian documents pertaining to the Mainz Stift Feud

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First posted on April 1st 2004, last revised on November 16th 2004

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