The Mosque of Cristo de la Luz is a former mosque in Toledo. It is the only one of ten that once existed in the city that remains largely as it was in the Moorish period. Legend has it that a shaft of light guided the king to a figurine of the crucified Christ that had been hidden for centuries. He left his shield there with the inscription, 'This is the shield which the King Alfonso VI left in this chapel when he conquered Toledo, and the first mass was held here'.
In 1186, Alfonso VIII gave the building to the Knights of the Order of St John, who established it as the Chapel of the Holy Cross (Ermita de la Santa Cruz). It was at this time that the mosque was renamed and the apse was added.
The edifice was then known as Mezquita Bab-al-Mardum, deriving its name from the city gate Bab al-Mardum.
Built in 999 in Toledo, this building is a rarity in that it is in much the same state as it was when it was originally built. The building is a small square structure. It measures roughly 8 m × 8 m. Four columns capped with Visigothic capitals divide the interior into nine compartments. Covering each of these bays is a vault that has a distinctive design that is unique unto itself. The central vault is higher than the other ones and acts as a cupola for the structure. Each vault employs the use of ribs to create the designs that make them unique. Each of them follows the basic ideas of Islamic design. The ribs typically do not cross in the center, an idea that is seen in many Muslim designs. Some of the designs are more rectilinear while others embrace the curved forms of the vault more prominently. Within each one is a piece of their culture and tradition of building. The columns and the capitals both had been taken from previous buildings and are therefore known as spolia.
The building is constructed of brick and small stones. These techniques are a reflection of both the local building tradition as well as the influence from the caliphate in Córdoba. The influence of the caliphate can be seen in the brickwork on the facade of the building which resembles those seen at the Cathedral–Mosque of Córdoba. Originally the Eastern wall was a continuous stretch of brick and served as the qibla wall for the mosque. Also located along this side would have been a mihrab used for worship. The other three facades are articulated by three-bay arcades. All are similar, but individual in their decoration.
The Western wall which served as the main entrance is unique in how the arcade is articulated. This facade has a lobed arch, horseshoe arch, and a wider version of a horseshoe arch. Brickwork arches provide the decoration for the facade which are influenced by the architecture in Córdoba. In later years a Mudejar semi-circular apse was added. In the process of the addition the qibla wall and mihrab were lost. The use of the mudejar style provided a smooth transition from the original structure to the apse, as the addition uses the same style of decoration and materials as the original. The continuation of the arch motif is an important link between the two sections of the building.
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The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.