In his days Edom revolted After they had been subject to Judah one hundred and fifty years, ever since the time of David, who subdued that country. This was a great dishonour to him. Hereby, however, the prophecy of Isaac (Gen 27:40) was fulfilled.
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.