The infobox gives Sancho Ramírez as builder, while the body begins with a first building program under Sancho el Mayor, who reconquered the surrounding lands around 1020. Sancho Ramírez installed Augustinian canons in 1073 and prepared from Loarre for the 1094 conquest of Huesca. A second program ran from about 1073 to 1097.
The castle and abbey are Romanesque. The keep stands isolated in front of the fortifications, linked by a wooden bridge, with a basement and five floors. The Torre de la Reina has three sets of twin-arched windows with columns the article links to Lombard and Mozarabic forms. The chapel of Saint Mary of Valverde received a vault at the end of the 11th century.
The outer curtain walls and eight towers date to the 13th or 14th century, and the infobox gives 1287. A major restoration came in 1913, with further work in the 1970s. The article gives no dimensions.
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