Castle of Obano

Castle of Obano is a medieval defensive tower in the municipality of Luna, in the province of Zaragoza, within the Cinco Villas region of Aragon.

Where exactly is the Castle of Obano?

The ruins stand in what was once the settlement of Obano, now abandoned, about two kilometers from the town of Luna, next to the Arba de Biel river. It's a quiet spot off the main tourist routes, set among the dry hills and valleys typical of Cinco Villas. It's worth noting that the municipality of Luna actually holds two castles — Obano and Yéquera — and this entry covers the smaller, more isolated one, Obano.

Who built the tower, and when?

King Sancho Ramírez ordered the tower built in the 11th century to secure the advance of Christian troops along the river valley and lay the groundwork for retaking the nearby towns of Luna and Ejea de los Caballeros from Muslim control. The earliest written record of the site dates to 1086, making it one of the older documented defensive structures in this part of Aragon.

What role did the Knights Templar play here?

Around 1167, the castle passed into the hands of the Knights Templar, granted to them by King Alfonso II of Aragon. The Templars used the tower as a watchpoint along the road connecting Ejea de los Caballeros to Huesca, keeping an eye on traffic and offering a measure of protection to travelers along that route.

What does the castle look like today?

What survives is mainly the tower itself — a solid structure roughly nine by seven meters at its base and about fifteen meters tall. Its walls run nearly two meters thick, a clear sign that this was built purely for defense rather than as a residence: a watchpost and refuge rather than a place to live. The crenellated top has deteriorated considerably and is visibly worn even from a distance, against the open Cinco Villas landscape.

The settlement of Obano that once surrounded the tower was abandoned by the late 14th century. From that point the structure gradually fell into ruin, and today only scattered traces of the old buildings remain around it. Despite the centuries, the tower still stands out over the surrounding terrain, a clear reminder of the border, defensive character this land had during the Reconquista.

Is the Castle of Obano legally protected?

Yes. It's listed as a Bien de Interés Cultural (Asset of Cultural Interest) under Aragonese heritage law, a designation that covers all the historic castles of the region. That status confirms its historical value, though the site itself has no visitor infrastructure — there are no facilities here of the kind found at larger monuments.

Frequently asked questions

How far is the Castle of Obano from Luna? The ruins sit about two kilometers from the center of Luna, on the site of the former, now-vanished settlement of the same name, beside the Arba de Biel river.

Is Obano the only castle in the municipality of Luna? No. The municipality also contains the Castle of Yéquera, a separate site with its own history and location that shouldn't be confused with Obano.

Who built the tower at Obano? King Sancho Ramírez ordered its construction in the 11th century, as part of the effort to strengthen the Christian position ahead of retaking Luna and Ejea from Muslim rule.

What was the Templars' connection to the castle? From around 1167, following a grant from King Alfonso II, the Knights Templar held and managed the tower, using it as a watchpost on the road between Ejea and Huesca.