During the reign of Alfonso III de Asturias, called “The Great”, the boundaries of the kingdom of Asturias extend up to the Duero river, secured by a series of fortifications like Oporto, Toro, Zamora, Simancas, Dueñas or Burgos. This wide strip of land was repopulated mainly by people that came from the overcrowded north, looking for new spaces and by Mozarabics that were fleeing from the ever increasing problems for Christians in Al Andalus. Two human groups with many points in common that would create a new society and a renewed way of artistic expression where once again the horseshoe arch will be recovered.
“Mozarabic Art” is usually used to denominate the set of Christian artistic manifestations that took place in Al Andalus and in the rest of the Iberian Peninsula between the beginnings of the 10th and the middle of the 11th centuries, that include horseshoe arches.
Further Reading: General Description of Mozarabic Art