The Kingdom of Kush based in Lower Nubia was a province of Ancient Egypt from the 16th century BCE to eleventh century BCE. During this period, the polity was ruled by a viceroy who reported directly to the Egyptian Pharaoh. It is believed that the Egyptian 25th Dynasty were descendants of these viceroys, and so were the dynasties that ruled independent Kush until the fourth century CE.
Viceroy of Kush Wikipedia
Below is a list of viceroys mainly based on a list assembled by George Reisner.