The dukes of Esau are listed here. Three terms were used: kings, princes, and dukes. Abraham, Isaac, and Jacob received promises in regard to kings; Ishmael received a promise in regard to princes; and Esau received a promise in regard to dukes. A duke is a lower rank than a prince.
Esau lost the spiritual blessing but was certainly blessed temporally. He had a large family, many flocks, and numerous servants. His son Eliphaz was associated with Job. Amalek was the forebear of the Amalekites. The Israelites later fought with the Amalekites when they crossed the Red Sea and entered the wilderness.