Castillo de Uncastillo

Castillo de Uncastillo is a medieval fortress overlooking the small town of Uncastillo in the Cinco Villas region of the Zaragoza province, Aragon. It sits on the rocky outcrop of Peña Ayllón, surrounded by steep slopes, with the town spreading out below it. The Riguel and Cadenas rivers, flowing at the base of the hill, have long served as a natural moat.

Where does the name come from?

Muslim chronicles record a fortress on this outcrop known as Unuh Qastil, an advanced military outpost of the Emirate of Córdoba. In the 10th century, Sancho Garcés I, ruler of Pamplona, captured the stronghold and renamed it Unum Castrum, reinforcing the settlement with a fortification of wood and rammed earth (tapial). That name is the origin of the town's current one.

How did the fortress take shape?

The medieval structure as it stands today was built between the 11th and 13th centuries, and for generations it served as the principal stronghold in the defensive line against the Kingdom of Navarre. In the 14th century, King Pedro IV "the Ceremonious" commissioned a Gothic palace inside the castle walls, entrusting the design to architect Blasco Aznárez de Borau, also responsible for the Aljafería palace in Zaragoza. The palace was laid out on a roughly rectangular plan, with two floors, large decorated windows, and a distinctive octagonal spiral staircase enclosed in a semi-octagonal tower leading up to the top floor and a lookout terrace.

What can you see on site?

The heart of the complex is the 13th-century Tower of Homage (Torre del Homenaje), rising four floors. It's worth the climb to the very top: the view stretches over the town and the surrounding hills of Cinco Villas. Inside the tower is a small museum with an audiovisual presentation on the fortress's history, alongside a display of old weapons and medieval building techniques. Next to the tower stands the Gothic palace described above, restored and open to visitors.

How to get there and when to visit?

Uncastillo lies at the heart of the Cinco Villas region, connected by local roads to Zaragoza. In summer, from June 1 to September 30, the castle is open daily from 11:00 to 14:00 and again from 17:00 to 20:00 — the split schedule lets visitors avoid the harshest midday sun and explore in cooler hours. A standard ticket costs 2 euros, while the reduced ticket (retirees, youth card holders, children under 14) costs 1.5 euros.

What else is worth seeing nearby?

The town of Uncastillo itself was declared a Historic-Artistic Ensemble in 1966, and the fortress was listed as a Bien de Interés Cultural (Cultural Heritage Site) in 1985. Nearby lie the remains of the Roman archaeological site of Los Bañales, with its forum, thermal baths, and aqueduct, while the town itself holds no fewer than six Romanesque churches from the 12th century, along with Renaissance palaces and stately houses.

Frequently asked questions

How much does a ticket to the castle in Uncastillo cost? A standard ticket costs 2 euros; the reduced rate (retirees, youth card holders, children under 14) is 1.5 euros.

What are the summer opening hours? From June 1 to September 30, the castle can be visited daily from 11:00 to 14:00 and from 17:00 to 20:00.

What is inside the tower of homage? A museum featuring an audiovisual presentation on the fortress's history, a collection of old weapons, and displays on medieval building techniques.

Is it worth climbing to the top of the tower? Yes — the top floor offers a panoramic view over Uncastillo and the surrounding hills of the Cinco Villas region.