Basilica: Maybe the most popular and archetypal church of the Christian art, since it was widely – if not exclusively – used during the early Christian period. In this architectural type the emphasis is on the length and therefore it is often characterized as basilican plan. Besides, one architectural origin of the basilica (since there are many disputes on its origin) are the Roman roads that had arcades supported by columns on their sides. According to another view, it derives from Roman halls of throne in the peristyle of the Roman houses or in the funerary chapels of the catacombs and the cemetery martyria. We distinguish two basilica types: the Hellenistic one (timber-roofed divided into three or more aisles by colonnades) and the eastern one (barrel-vaulted, three-aisled divided by pillars).