a basement and three floors, is particularly noteworthy for three sets of twin-arched windows, with columns of exaggerated entasis and trapezoidal capitals that have been related to both Lombard and Mozarabic architectural forms. The chapel is composed of a single-cell nave with an eastern apse covered by a semicircular vault. The original timber roof of the nave was replaced by a vault at the end of the 11th century. Bibliography R. del Arco: El castillo-abadía de Loarre, Semin. A. Aragon., xiii?xv (1968), pp. 5?36 F. Iñiguez Almech: Las empresas constructivas de Sancho el Mayor: El castillo de Loarre, Archv Esp. A., xliii (1970), pp. 363?73 A. Canellas-López and A. San Vicente: Aragon Roman, Nuit Temps (La Pierre-qui-vire, 1971) A. Duran Gudiol: El castillo de Loarre (Saragossa, 1971) J. F. Esteban Lorente, F. Galtier Martí and M. García Guatas: El nacimiento del arte románico en Aragón: Arquitectura, Investigaciones de Arte Aragonés (Saragossa, 1982) J. E. Mann: San Pedro at the Castle of Loarre: A Study in the Relation of Cultural Forces to the Design, Decoration and Construction of a Romanesque Church (diss., New York, Columbia U., 1991) References External links Castillo de Loarre (es) Loarre Castle: photos and history Castles in Aragon Buildings and structures in the Province of Huesca Buildings and structures completed in the 12th century Romanesque architecture in Aragon Tourist attractions in the Province of Huesca