The Professor Kazimierz Michałowski Faras Gallery is the only permanent exhibition in Europe featuring Medieval Nubian paintings from the Nile River Valley south of the First Cataract. The collection of over 60 paintings from the 8th to 14th centuries came from the cathedral in the city of Faras, a large urban centre in the Medieval kingdom of Nobadia, in present-day Sudan. 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.