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However, his parents managed to finance his studies at the University of Mainz (in the Archbishopric of Mainz of the Holy Roman Empire, nowadays in Rhineland-Palatinate), where he became a Dr. phil. with his Latin dissertation on the notion of enthusiasm.
At the court of Otto I, then King of Germany, the title seems to have been an appanage of the Archbishop of Mainz.
Already in medieval times the Chancellor had political power like Willigis of Mainz (Archchancellor 975–1011, regent for Otto III 991–994) or Rainald von Dassel (Chancellor 1156–1162 and 1166–1167) under Frederick I.
In 1269, Geiselbach had its first documentary mention in a purchase agreement between the Seligenstadt Monastery and the Archbishopric of Mainz, between Abbot Conrad and Archbishop Werner.
On October 1, 1445, the cathedral chapter of Eichstätt Cathedral elected him to be the Prince-Bishop of Eichstätt; his appointment was confirmed by Dietrich Schenk von Erbach, Archbishop-Elector of Mainz later that month.
In order to improve his financial position, he accepted early in 1786 the post of librarian to Friedrich Karl Joseph von Erthal, the prince-elector and of archbishop of Mainz, who bestowed many important offices upon him and obtained his elevation to nobility from the emperor Leopold II.
The Archbishopric of Mainz objected to the reformation policy of Hanau-Lichtenberg and saw to it that Catholicism prevailed in the condominiums of Ober-Roden and Rodgau.
1694 - 1732 Count Palatine Francis Louis of Neuburg, also Grand Master of the Teutonic Knights and Prince-Bishop of Worms, Elector and Archbishop of Trier from 1716 and of Mainz from 1729
In 1773, Pope Clement XIV issued the papal brief Dominus ac Redemptor, resulting in the Suppression of the Society of Jesus and as a result, the Society of Jesus, which had run Mainz's system of higher education, was expelled from the Archbishopric of Mainz.