The traditions about the al-Andalus conquest period(711-756) provide some clues to interpret the Islamization and Arabization process of the Iberian Peninsula, as well as the construction of the first locations of muslim prayer. These religious foundations were located in strategic places from a political or symbolic point of view, in places linked to an important conquest event. Despite the emirate instability, the conquerors Musa, Tarik, al-Azis considered mosques to be one of the main cohesion instruments of the faithful community, essential in the development and expansion of Islam. Therefore, with regards to the construction of mosques, we cannot forget their special contribution to the development of al-Andalus. Especially due to reasons of religious prestige and political legitimacy, the orientation of the first mosques is attributed to characters of recognized pious prestige, essentialy Arab, such as the legendary conqueror Musa and the two tabiun who supposedly accompanied him. Thanks to them mosques helped make Islam´s presence visible in the conquered territory. In this document, we aim to show the importance and meaning of the first al-Andalus mosques. Also, we want to highlight the Arab conqueror´s enthusiasm for the construction of mosques or aljama mosques.