Vintém 'S / L-G' - Sebastião I

Sebastião I came to the throne at three years old in 1557, with his grandmother Catherine of Austria serving as regent until 1562 and then Cardinal Henry until 1568. The vintém issues of his reign are consequently minted under shifting administrative authority, and the mint mark combinations — including the 'S / L-G' pairing — reflect the overlapping responsibilities of assayers and mint masters during a regency period that changed hands twice before the king reached majority.

Sebastião's reign ended at Alcácer Quibir in 1578, where he died without an heir at roughly 24, triggering the succession crisis that would deliver Portugal into the Iberian Union under Philip II of Spain just two years later.