Edict of Fontainebleau
When after the Edict of Fontainebleau in 1685 ten thousands of Huguenots had to leave Catholic France the city allowed them using Frankfurt as a transit stop, with 26,000 refugees passing, on their ways to other states allowing their immigration. Only in 1787 the Lutheran council allowed the construction of, modest though, Reformed churches within the city, without tower and bells.