alternatehistory.com

Today, the only theocracy in Europe is the Vatican City, and the only other state where the head of state is a Church official is Andorra. Historically, there were many Prince-Bishoprics in Europe - Salzburg, Trier, Mainz, Cologne, the Papal States are all key examples. Most of these were secularised during the Napoleonic Wars and those that weren't were absorbed to other states or otherwise secularised afterwards. In 1815, the only remaining prince-bishopric or otherwise theocratic states were the Papal States, and Montenegro.

The challenge is preferably to have some of the prince-bishoprics restored during/after the Congress of Vienna, in 1815. However, the earliest POD allowed is 1789, but if you can, do try to get it 1815 or later. Bonus points for each prince-bishopric that survives, extra bonus points if you get Salzburg, the various bishoprics of the Rhineland (Cologne, Trier etc) and the Bishopric of Strassburg restored.
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