Dinero - Fernando IV Coruna

Fernando IV inherited the Castilian throne at age nine, and his minority was immediately contested — his legitimacy challenged by rivals including his great-uncle Sancho IV's surviving opponents and the Infante de la Cerda claimants backed by France and Aragon. The crown's financial instability during these years forced repeated debasements of the billon coinage, and the dineros struck at Coruña reflect a mint that was politically marginal and chronically underfunded.

The Coruña mint mark on this type is the key attribution detail; AB#321 encompasses multiple mints, and misattribution is common in the trade.