1 Peça - João Prince Regent Lisboa and Rio mints

The 1 Peça issues of João as Prince Regent span one of the most turbulent periods in Portuguese monetary history. When the Napoleonic invasion forced the Braganza court to flee Lisbon in November 1807, the Rio de Janeiro mint took on the extraordinary role of supplying gold coinage for a Portuguese empire now governed from Brazil. The two mints thus operated in parallel across the Atlantic, producing coins of nominally identical authority for a sovereign who had physically abandoned his European capital.

Distinguishing Lisboa from Rio strikes matters for attribution — the mint mark remains the critical variable, as die workmanship between the two facilities differed noticeably in this period.