Rashi on Genesis 36:31/רש"י על בראשית ל״ו:ל״א

1’ואלה המלכים וגו AND THESE ARE THE KINGS etc. — There were eight and Jacob raised an equal number in whose days the kingdom of Esau temporarily ceased to exist, viz., Saul, Ishbosheth, David, Solomon, Rehoboam, Asa, Abiah and Jehoshaphat. For of the days of Yoram his (Jehoshaphat’s) son it is written, (2 Kings 8:20) “In his days Edom revolted from under the hand of Judah and made a king over themselves”, whereas in the days of Jehoshaphat it is written, (1 Kings 22:48) “And there was no king in Edom: a deputy was king”.