John Wesley on 2 Kings 1:17

Jehoram - His brother. The son of Jehoshaphat - Jehoshaphat, in his seventeenth year, when he went to Ahab, and with him to Ramoth - Gilead, appointed his son Jehoram his vice - roy, and (in case of his death) his successor. In the second year from that time, when Jehoram was thus made vice - king in his father's stead; this Jehoram, Ahab's son, began to reign: and in the fifth year of the reign of this Jehoram son of Ahab, which was about the twenty - fourth year of Jehoshaphat's reign, Jehoram son of Jehoshaphat was made king of Judah, together with his father.