Real Branco - Fernando I Zamora, Spain Mint

Fernando I struck these bilhão reais brancos under conditions of acute monetary stress — his reign saw Portugal drawn into repeated Castilian conflicts, and the currency was systematically debased to fund military expenditure. That Zamora, a Castilian city, served as a mint for Portuguese coinage reflects one of the stranger episodes of Ibero-medieval numismatics: Fernando's intermittent alliances and territorial negotiations with Castile occasionally granted him access to foreign minting infrastructure. The precise arrangement remains disputed among specialists.