In 1694, he assumed the additional offices of Hochmeister of the Teutonic Order and Prince-Bishop of Worms. 1716, he became Archbishop-Elector of Trier. During his rule in Trier, he reorganized the jurisdiction in the diocese and advanced the renovation of the Roman Moselle bridge and the cathedral. He became Archbishop-Elector of Mainz in 1729, giving up the position in Trier as the Pope had prohibited a merging of the two Archbishoprics. In Mainz, Franz Ludwig also started some administrative and judicial reforms as well as the construction of the Deutschhaus. In Worms, he started the reconstruction of the Bischofshof palace, which was destroyed in 1689.
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