Located at the highest point of the village of Alandroal, in the centre and surrounded on the west side by buildings that have been appropriated, the Castle of Alandroal is one of the most well dated works of military architecture of the reign of King Denis of Portugal, thanks to two inscriptions, commemorating the beginning and the conclusion of the construction work (6 February 1294 and 24 February 1298), visible, respectively, on one of the doors of the fort and on the western elevation of the Keep.
This is a typical medieval Gothic fortification, tending to be oval, with a three-storey quadrangular planted keep, attached to the fence and main door, protected by two quadrangular towers. Some time later, the town's main church was added. The clock tower dates back to the 18th century.
The Alandroal fort is important for the characterization of the military architecture of the Dionysian period and also for the recognition of the great investment made at that time in castles in Alentejo. A third inscription, identifying a man from the Muslim community (self-titled "I, Moor Galvo") as responsible for conducting the work, is still considered one of the most important Mudéjar marks in our country.
In the following centuries, the castle of Alandroal would not have played a role of great military relevance, as it quickly fell into decay, with most of the buildings inside the fence being ruined at the beginning of the 17th century.
