In the suburbs of Toledo San Nicolas is located in a former mosque Cristo de La Luz. This is one of the best preserved mosques of Spain and one of the oldest buildings on the territory of Toledo. The mosque, called Bab-al-Mardum, was erected in 999, under the leadership of the Arab architect Musa Ibn Ali de Saad, whose work was influenced by the great mosque of córdoba.

There is evidence that the mosque was built on the remains located here earlier Visigothic Church. After the expulsion of the Arabs from Toledo by order of king Alfonso VI of the mosque was converted into a Christian Church dedicated to the Saviour and called the Cristo de La Luz.

The facade of the building from the South-West side is decorated with an inscription proving the time of its construction, and glorifying the greatness of Allah. North facade attracts attention with its original brickwork and coloured tiles. The entrances to the building are decorated in the form of horseshoe-shaped arches. The upper part of the facade is decorated with original frieze, the roof is supported by a graceful brackets. Thanks to the many fairly large Windows the interior of the Church is well illuminated by the light. In one of the parts inside the Church of the arch is a nine domes supported by rows of columns, decorated with Visigothic capitals. Particularly noteworthy are the frescoes inside the Church and belonging to the 13th century. In the process of converting the mosque into a Catholic Church to it was added an apse, the construction of which used the same stone and the same decorative design as the main building.