Jehoram son of King Jehoshaphat of Judah began to rule over Judah in the fifth year of King Joram's reign in Israel. Joram was the son of Ahab.
Jehoram was thirty-two years old when he became king, and he reigned in Jerusalem eight years.
But Jehoram followed the example of the kings of Israel and was as wicked as King Ahab, for he had married one of Ahab's daughters. So Jehoram did what was evil in the LORD's sight.
But the LORD was not willing to destroy Judah, for he had made a covenant with David and promised that his descendants would continue to rule forever.
References for 2 Kings 8:19
During Jehoram's reign, the Edomites revolted against Judah and crowned their own king.
So Jehoram went with all his chariots to attack the town of Zair. The Edomites surrounded him and his charioteers, but he escaped at night under cover of darkness. Jehoram's army, however, deserted him and fled.
References for 2 Kings 8:21
Edom has been independent from Judah to this day. The town of Libnah revolted about that same time.
The rest of the events in Jehoram's reign and all his deeds are recorded in The Book of the History of the Kings of Judah.
When Jehoram died, he was buried with his ancestors in the City of David. Then his son Ahaziah became the next king.