<p>In the 9th century CE, the city of Aswan, Egypt was a prosperous provincial capital on the pilgrimage route to Mecca and Medina via the Red Sea, as well as trade routes connecting the Nile River to the Wadi al-Allaqi mines, Egypt's main source of gold. The city was identified by medieval writers and geographers as situated at the frontier between Muslim Egypt and Christian Nubia. Salvage excavations under the auspices of the Swiss-Egyptian mis...