½ Plaque - Jean the Blind Luxembourg-Bar Convention

Jean the Blind — John I of Bohemia, Count of Luxembourg — issued this coin in the final years of his life, before his death at Crécy in 1346, famously fighting for the French despite being completely sightless. The Luxembourg-Bar monetary convention of 1343–1344 was a formal agreement regulating silver coinage between the County of Luxembourg and the Barony of Bar, an early attempt to stabilize regional monetary standards in the fragmented currency environment of the upper Meuse and Moselle.

Jean's blindness dated from around 1336, yet he remained one of the most politically active rulers in the region until his end.