Rhenish Law in a broad sense is the early modern law that pertained in the territories along the banks of the Rhine (Particular law). In a stricter sense, it means the French law that pertained in the territories along the left bank of the Rhine between Konstanz and Kleve in the 19th century.

Following the Treaty of Lunéville (1801), France began imposing conformity with the French legal system in the conquered Rhenish territories. This put an end to the legal fragmentation into many local systems that had been characteristic of the ancien régime in these territories. As this was be…