Dinero - Fernando III Leon

Fernando III unified the crowns of Castile and León permanently in 1230 when he inherited León following his father Alfonso IX's death — an earlier union under his mother Berenguela had lasted only three years before political pressure forced its dissolution. His reign also saw the conquest of Córdoba in 1236 and Seville in 1248, dramatically reshaping the Iberian monetary economy as newly taken cities required immediate coinage to function. The billon dinero served that practical demand across an expanding frontier.