2 Kings 1:17

17So Ahaziah [the son of King Ahab] died in accordance with the word of the Lord which Elijah had spoken. And because he had no son, Jehoram [his younger brother] became king [of Israel, the northern kingdom] in his place in the 1:17 During the last five years of Jehoshaphat’s reign in Judah, his son Jehoram was co-regent with him. This refers to the second year of the co-regency.second year of Jehoram the son of Jehoshaphat, king of Judah [the southern kingdom].