Infanta doña SANCHA de Castilla (1155-Sijena 9 Nov 1208, bur Sijena, monastery of Nuestra Señora). The "Corónicas" Navarras name "la filla del Emperador dona Sancha" as the wife of "el rey don Alfonso d'Aragón"[612]. The Gestis Comitum Barcinonensium records the marriage of "Ildefonsus" and "Sanciam…filiam Imperatoris Magni Ildefonsi de Castellæ"[613]. Her name is confirmed in the charter dated 24 Feb 1212 under which Pedro II King of Aragon "filio Sanctiæ…Reginæ Aragonum" granted property to "Guillelmo de Montepessulano…filius Agnetis feminæ"[614]. She founded the Hospitaller priory of nuns of Nuestra Señora at San Juan de Sijena in 1188, and became a nun there herself in 1197. The Anales Toledanos record the death in 1208 of "la Reyna Doña Sancha Daragon, filla del Emperador" and her burial "en Sixena"[615]. m (Zaragoza 18 Jan 1174) don ALFONSO II "el Casto" King of Aragon Conde de Barcelona, son of RAMÓN BERENGUER IV Conde de Barcelona & his wife Petronilla Queen of Aragon (Villamayor del Valle, Huesca 1/25 Mar 1157-Perpignan 25 Apr 1195, bur Poblet, monastery of Nuestra Señora).