That political events from ancient times had a great influence in various fields of life, and even in the field of free choice and practice of religion, is a good testimony to the changing late antique attitude towards Christians. Namely, they got the freedom to publicly practice their religion in the first decades of IV. century, with the edicts of Galerius and Constantine, which also includes building basilicas. Already at the end of IV. or else at the beginning of the 5th century, some of the basilicas were doubled, creating double buildings (basilicae geminatae). Although the majority of double basilicas were built successively, there are also those that were built simultaneously. From an architectural point of view, they are nothing more than doubled basilicas: two churches most often placed parallel to each other, and less often one behind the other. As many as twenty of them have been discovered and explored in the area of the Roman province of Dalmatia. However, they are not exclusively a local phenomenon of that province, but were represented in large numbers throughout the entire Mediterranean, which at that time was an integral part of the Roman Empire. Although numerous researchers have dealt not only with the question of their origin and purpose, but also with the question of who first discovered this problem, we still do not have a final solution that could be applied to all discovered double basilicas.