This case study of the Alsatian community of Sainte-Marie-aux-Mines argues that although
negotiating religious differences at the local level was essential to defining community, the political
context was essential in setting the framework. Straddling the Lorraine/Alsace border, Sainte-Marie
was divided among Catholics, Lutherans, Calvinists, Zwinglians and Anabaptists as well
as between French- and German-speakers. After the Thirty Years' War, the changing demographic
balance among the confessional groups, especially the immigration of Catholics necessitated a re-evaluation
of Catholic/Protestant coexistence. The Peace of Westphalia established a legal
framework in the imperial territories based on cuius regio eius religio. France's 1648
annexation of most of Alsace, meant that French centralising authority collided with this seigneurial
territorial system. The French crown could not, however, govern without the co-operation of the
local authorities: religious groups at Sainte-Marie exploited the resulting ambiguities. In uneasy
coexistence Catholics enjoyed royal favour and Protestants had the protection of the local seigneurs.
This local outcome mirrored the imperfect process by which the French monarchy imposed itself on
the imperial system of Alsace.