The castle was an important point on the fortified line which existed between the medieval Christian Kingdom of Castile and the ogival arch that marks the entrance.
22.
The main gate, executed by master Bartolomeu from 1277 to c . 1291, features ogival arches of decreasing size enclosed in a square-like tympanum.
23.
An ogive or ogival arch is a pointed, " Gothic " arch, drawn with compasses as outlined above, or with arcs of an ellipse as described.
24.
The inner turret is very disfigured by later additions and reforms, under the reign of Charles II, while the exterior keeps its ribbed vaults and ogival arches and horseshoe.
25.
The arcades of the galleries are organized in groups of three smaller circular arches, surmounted by couples of small rose windows and, above them, a large ogival arch.
26.
Witnesses thereof are a deep, blind niche, which frames the ogival arch of the gateway and used to house the drawbridge, and the still visible roller holes for the chains.
27.
The scene is set within church, finely decorated in Gothic style ( somewhat similar to the Cathedral of Siena ) with a nave and two aisles, each surmounted by three-foiled ogival arches.
28.
Clearly Byzantine is the exterior, in particular in the external walls, in the fake columns of the apse, which forms ogival arches, and in the 16 small columns decorating the dome's tambour.
29.
The entrance door is surmounted by an ogival arch and a rose window, dated 1163 and signed by one " Johannes ", identified by some with Giovanni da Gubbio, the architect of the Assisi Cathedral.
30.
The church of St . Gr�goire, built at the end of the 12th century is in the purest Romanesque style, apart from the window above the front door which was reconstructed with an ogival arch in a former Romanesque bay.
