The Friday mosques of Al-Andalus came to acquire great importance. However, this has not been translated into any further study of them. Even today, it is difficult to fit them into existing lines of research on Al-Andalus. In part, this paradox has arisen as a result of the little information available on these mosques until recent years, due to certain historical dynamics: after the conquest, many mosques were replaced by churches and even cathedrals, leading to the loss of the former Islamic constructions over time. In some places, there are hardly any hypotheses about where the mosque might have been located. Such enigmas are difficult to solve today due to a resistance to change in some traditional historiographical beliefs, the difficulties required to work on buildings used for worship today, the frequent paralysis among certain heritage managers and, in a certain sense—although with honourable exceptions—, also to the low level of interest in the scientific community and society as a whole.