Edom, which had been reduced by David 2Sa 8:14; 1 Kings 11:15-16, but had apparently revolted from Solomon 1 Kings 11:14, was again subjected to Judah in the reign of Jehoshaphat 2 Kings 3:8-26. The Edomites had, however, retained their native kings, and with them the spirit of independence. They now rose in revolt, and fulfilled the prophecy Genesis 27:40, remaining from henceforth a separate and independent people (Jeremiah 25:21; Jeremiah 27:3; Amos 1:11, etc.). Kings of Edom, who seem to be independent monarchs, are often mentioned in the Assyrian inscriptions.
Related Commentaries of 2 Kings 8:20
2 Kings 8:20
20 In his days Edom revolted from under the hand of Judah, and made a king over themselves.