Fausset's Bible Dictionary
Son of Eliphaz, by his concubine Timnah, of the Horites; grandson of Esau; duke of Edom (Genesis 36:12; Genesis 36:16). The Edomites seized the Horite territory. In Hezekiah's reign, the last remnant of Amalek in Edom was dispersed by the Simeonites (1 Chronicles 4:42-43).
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Fausset, Andrew R. Entry for 'Amalek'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/a/amalek.html. 1949.