Today only the church of San Pedro de Siresa remains, but originally it was part of a larger monastery. Perhaps the first monastery that existed in the old Kingdom of Aragon.
Although there are those who speak of a first religious construction in Siresa in Visigothic times, possibly the origins of that original abbey are Carolingian, at the beginning of the 9th century, when Charlemagne from France it became the brake for the Muslim invasion that had taken place in Al-Andalus. There is some historical document that would certify it. Instead of what there is no guarantee, it is that the Holy Grail will be kept here, just as a legend says.
San Pedro de Siresa
The current church has a Latin cross plan with a semicircular apse and a single nave, but it dates back to that time. It is a Romanesque building built in 1082, when it even became the Royal Chapel of King Sancho Ramírez.
However, archaeological excavations have brought to light pre-Romanesque remains, when the temple would have three naves and a quadrangular apse. On the other hand, today we have a nave that is covered with a barrel vault divided into sections by transverse arches. That barrel vault is also used in the wings of the transept, receiving a different cover in the center of the transept.
It is knownthat at some point on the central section of that transept there would be a dome as support for a semi-orange dome. But that fell in a fire that suffered the building, and it was decided to replace it with a simpler groin vault.
A very curious aspect of this Romanesque construction is that it completely lacks sculptures integrated into the work or reliefs. Something that undoubtedly differentiates it from many other contemporary temples, both in Aragón, such as the cathedral of Jaca, and in different places in Spain (Santiago de Compostela Cathedral) or Europe, either in France, Italy, etc…
Although it does have a decorative element, a Chrismon. Something emblematic of the Aragonese Romanesque churches, since we can see it in Santa Cruz de la Serós as well as in the monastery of Alaón, or in many temples of the time.