Tornês de Busto - Fernando I Lisboa mint

Fernando I's reign was defined by three disastrous wars against Castile, and his coinage reflects the fiscal strain of sustaining them. The tornês de busto was introduced as part of a broader monetary reorganization, but the silver content was already compromised from the outset — .250 fineness placed it firmly in the billon range, a deliberate debasement that the Lisbon mint executed under royal pressure to stretch bullion supplies.

Fernando died without a male heir in 1383, triggering the succession crisis that ultimately brought the House of Aviz to power. Coins from his reign circulated through one of the most politically turbulent transitions in Portuguese history.