Nubian Pharaohs of Egypt

This is the story of Egypt's remarkable reign of Nubian kings who ruled Egypt as its 25th Dynasty.

The traditional role for most of Egyptian history was the Nubian's were subjects of the Egyptian pharaoh to the north but for about 50 years when between 716-656 bc the kings of Nubia also bore the titles of the lord of the two lands and became kings of Egypt.

http://ngm.nationalgeographic.com/ngm/2008-02/black-pharaohs/draper-text.html