Governor of Egyptian Nubia during the New Kingdom whose title was literally King’s son of Kush, although no royal princes ever held this office. The title was established in early Dynasty 18 and continued until the end of Dynasty 20 when Viceroy Panehsi became embroiled in the civil war in the Theban region at first by royal command but was eventually driven back to Nubia by Piankh. Egyptian control of Nubia seems to have lapsed at his death, but the title was used purely symbolically by descendants of Piankh.
Historical Dictionary Of Ancient Egypt by Morris L. Bierbrier
Ancient Egypt. A Reference Guide. EdwART. 2011.