The "Drielander" designation refers to a monetary agreement struck between Brabant, Flanders, and Hainaut in the early 1420s to standardize a common billon coinage across three territories — a rare instance of coordinated monetary policy among rival Netherlandish powers. John IV, whose reign was plagued by debt and factional conflict with the nobility, needed the arrangement as much for fiscal credibility as for commercial convenience.
The brief window of issue, a single year, reflects how quickly such inter-territorial agreements tended to collapse under competing debasement pressures.
The "Drielander" designation refers to a monetary agreement struck between Brabant, Flanders, and Hainaut in the early 1420s to standardize a common billon coinage across three territories — a rare instance of coordinated monetary policy among rival Netherlandish powers. John IV, whose reign was plagued by debt and factional conflict with the nobility, needed the arrangement as much for fiscal credibility as for commercial convenience.
The brief window of issue, a single year, reflects how quickly such inter-territorial agreements tended to collapse under competing debasement pressures.