Other, non-Egyptian cultures of the Nile, from the 8th century BCE to the 16th Century - African, Egyptian, Greek, Arab, Christian, Moslem, pagan. A Combination of three publications of the British Museum Press.
This is one large compilation of 3 books. The first two were a bit of a slog to get through (especially the second one), while the third was enjoyable. Each book focuses on a different kingdom: Kush, Nubia, & Ethiopia. I didn't realize how much Christianity was involved in these kingdoms.