Valença

Valença stands above the Minho opposite the Galician town of Tui, making it a prominent frontier settlement between Portugal and its northern neighbor. River crossings, cultivated countryside, and roads gave the town commercial value as well as military importance. Local agriculture supplied food and wine, while traffic across the border supported exchange and services.

The medieval fortified town, then called Contrasta, guarded the Minho frontier from the early thirteenth century. During Portugal's Restoration War of 1640–1668, Valença was transformed into a bastioned fortress under the engineer Michel de L'École. Spanish forces attempted to take it in 1643 and 1657. Its defenses protected a major route between northern Portugal and Galicia, while the river also linked communities on both banks.