The basilica is 27 metres wide and about 100m long, according to Yana Borissova-Katsarova, head of research at the site. It featured multi-coloured mosaics. Further exploration of the find will be difficult because of its location under the modern city.
Sofia deputy mayor in charge of culture, Todor Chobanov, said that the discovery of the basilica may be proof that Constantine intended to establish the city as a centre of Christianity.
Constantine, who ruled from 306 to 337 CE, was the first Roman emperor to convert to Christianity. Sofia, as Serdica, was under Roman rule from 29 BCE and remained under Roman and later Byzantine rule, with some interruptions because of Hun invasions and destruction, for a number of centuries.
Story: Sofia Globe | Photo: Sofia Globe