This volume records the results of excavations and investigations undertaken by the EES between 1963 and 1998 on the largest surviving building, the Cathedral Church, at the site of Qasr Ibrim, one of the very few not totally destroyed by inundation following the construction of the Aswan Dam and the creation of Lake Nasser. It sets out the archaeological evidence, which has resulted from excavations and a detailed study of the surviving fabric, and provides an interpretation of that evidence for the construction of the Cathedral Church, including its subsequent abandonment and use as a domestic dwelling and then an Ottoman Mosque. It also places the building and the site within the context of medieval Nubia.