Nobadian rulers controlling the Nile Valley from the first to the third cataracts converted to Christianity around 548 AD influenced by missionaries sent from Constantinople by the Empress Theodora. The first cathedral was erected in the 7th century, when the city was still known as Pachoras, and likely stood at the exact site where Polish archaeologists taking part in the Nubia Campaign discovered the subsequent 8th-century cathedral. The site was excavated by Polish archaeologists under Kazimierz Michałowski between 1960 and 1964.[1]