The Castle of Alcácer do Sal crowns the hill above the town and the river Sado, and is the great landmark of Alcácer — a fortress whose story reaches back across millennia.
The site has been occupied since prehistory, and was settled in turn by Phoenicians, by Romans — who knew the town as Salacia — and, from the eighth century, by Muslims, for whom it was an important river port; the Arabic name al-Qasr, meaning the fortress, gave the town its name. The castle was finally taken for the Portuguese crown in 1217, under King Afonso II, after a long siege. It later served as the seat of the Order of Santiago, and later still housed a convent.
From the ruins, the Pousada D. Afonso II was created, opening in 1998, so that today visitors can stay within the castle walls. The castle hill also holds the Church of Santa Maria do Castelo and the archaeological crypt, and the ramparts give wide views over the white town, the Sado and the Alentejo plain.
Highlights
- Hilltop castle above the town and the river Sado
- Origins reaching back through Phoenician and Roman times
- Taken for the Portuguese crown in 1217 under Afonso II
- Once the seat of the Order of Santiago
- Now home to the Pousada D. Afonso II, with wide views
History & context
The hill of Alcácer do Sal has been occupied since prehistory. It was settled by Phoenicians, then by Romans — who knew it as Salacia and granted it city status — and, from 715, by Muslims, who made it a major river port; the Arabic al-Qasr gave the town its name. Conquered for the Christians in 1217 under King Afonso II, after a siege coordinated with a crusader fleet, the castle was given to the Order of Santiago and served as its seat. It later housed the Convent of Aracoeli. From the late twentieth century the ruins were converted into the Pousada D. Afonso II, which opened in 1998.
🗓️ Best time to visit
Spring and autumn for mild weather; late afternoon for the light over the Sado and the plain.
⏱️ Duration
1–1.5 hours
♿ Accessibility
Limited. The castle sits on a hill reached by steep streets, with historic surfaces and steps within the walls.
Frequently asked questions
How old is the Castle of Alcácer do Sal?
The hill has been occupied since prehistory, with Phoenician, Roman and Muslim settlement; the castle was taken for Portugal in 1217.
Can you visit the castle?
Yes. The castle holds a pousada, the Church of Santa Maria do Castelo and an archaeological crypt, and the ramparts give wide views.
Why is the town called Alcácer?
The name comes from the Arabic al-Qasr, meaning the fortress — a reference to the castle that crowns the town.