Alfonso X's monetary reforms of the 1260s and 1270s were driven less by economic vision than by chronic fiscal desperation — his Italian campaigns for the Holy Roman Imperial throne drained the treasury continuously. The *prieto* designation refers to the coin's notably dark appearance, a consequence of the very low silver content in the billon alloy, a debasement that provoked serious unrest among Castilian merchants and creditors who had contracted debts in better money.
The Burgos mint was among the most active under Alfonso's reign, operating under royal supervision as part of his broader attempt to centralize monetary production away from feudal and ecclesiastical mints.
Alfonso X's monetary reforms of the 1260s and 1270s were driven less by economic vision than by chronic fiscal desperation — his Italian campaigns for the Holy Roman Imperial throne drained the treasury continuously. The *prieto* designation refers to the coin's notably dark appearance, a consequence of the very low silver content in the billon alloy, a debasement that provoked serious unrest among Castilian merchants and creditors who had contracted debts in better money.
The Burgos mint was among the most active under Alfonso's reign, operating under royal supervision as part of his broader attempt to centralize monetary production away from feudal and ecclesiastical mints.