Rhenish Prussia

DE 50.367, 7.600

Bare polity, not a settlement: the Rhine Province (Rheinprovinz) of Prussia, 1822-1945, no single modern successor (split across NRW, Rhineland-Palatinate and Saarland) — stays current with a centroid per the 'bare polity' rule. Used as an _ORIG tag on three siblings whose other events are in Baden-Württemberg.