Vierlander
A name given to the double Gros, when the same type was adopted by four districts or principalities.
Thus Philippe le Bon of Burgundy, and his successor, Charles le Temeraire, struck a Vierlander, current in Brabant, Flanders, Holland, and Hennegau.
Source: Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)