The transition from the pure Arabic and Almohade styles of architecture to what is called the Mudejar style was therefore almost imperceptible. The physiognomy of the city altered but slowly. But the alteration was from the first inevitable. Houses and lands were bestowed on knights from all parts of Spain on the condition of their residing permanently in Seville. Catalans, Galicians, Castilians of all trades and ranks flocked in, and their influence was bound sooner or later to assert itself. But the builders and artisan class remained for many years composed of Moors--sometimes Christianised, but thoroughly imbued with the artistic traditions of their forebears. Thus came about that peculiar and graceful blending of the Moorish and Gothic and earlier Renaissance styles known to Spanish writers as the Mudejar. Its differentiation from the Arabic naturally became more marked as the centuries rolled by. Moorish architecture was thus accepted by the conquerors of Seville both from choice and necessity. But certain important modifications in the structure of buildings became immediately necessary, owing to the difference of faith and customs. The mosque and the dwelling-house alike had to undergo some alteration. No _mihrab_ was required, nor minaret, nor the south-easterly position; in the dwelling-house there was no need for harem, for retired praying-place, for the baths so dear to the Andalusian Muslim. Probably the first building of importance to be affected by the change of rulers was the mosque. The outermost naves were divided into chapels, the names and order of which have been preserved for us by Zuñiga (quoted by Madrazo). The royal chapel occupied the centre of the eastern wall; the other chapels were: San Pedro, Santiago, Santa Barbara, San Bernardo, San Sebastian (in this chapel were buried some Moors of the blood royal who had been baptised and had served King Ferdinand, among them being Don Fernando Abdelmon, son of Abu Seyt, Amir of Baeza), San Ildefonso, San Francisco, San Andrés, San Clemente, San Felipe, San Mateo (containing the sepulchre of the Admiral of Castile, Don Juan de Luna), Don Alonso Perez de Guzman, San Miguel, San Marcos, San Lucas, San Bernabe, San Simon, and San Judas, and the Magdalena. In the last-named chapel were buried the knights who had taken part in the capture of the city. Attached to it was the altar of Nuestra Señora de Pilar, a reputedly miraculous shrine which became the objective of pilgrims in after years.