Last month, the University of Warsaw’s Polish Centre of Mediterranean Archaeology (PCMAUW) said its experts had discovered the remains of a Medieval cathedral in the ancient town of Old Dongola, along the east bank of the Nile River in what is now Sudan. Archaeologists believe the cathedral may now be the largest known surviving structure from Christian Nubia. Old Dongola was the capital of one of three Christian Nubian kingdoms, Makuria, which existed from the 6th century C.E. to the 14th century C.E. It grew to encompass churches, monasteries, a palace, pottery workshops, and cemeteries, and it also had elaborate...