1/4 Groat 'Vierlander'- Philip the Good

Philip the Good's monetary reforms for the Low Countries, consolidated through a series of ordinances beginning in the 1430s, forced a degree of standardization across his Burgundian territories that smaller regional mints had long resisted. The Vierlander — named for the monetary union of four lands — emerged from a 1433–34 agreement binding Holland, Zeeland, Hainaut, and Brabant to a common small-change coinage, an arrangement as much political as economic.

The billon content drifted noticeably across the issue's three-decade span as Philip repeatedly adjusted fineness in response to silver shortages and cross-border counterfeiting, particularly from ecclesiastical mints operating outside the union's jurisdiction.