1 Kings 22:41 KJV
And Jehoshaphat the son of Asa began to reign over Judah in the fourth year of Ahab king of Israel.
1 Kings 22:41, King James Version
In context
40 So Ahab slept with his fathers; and Ahaziah his son reigned in his stead.
41 And Jehoshaphat the son of Asa began to reign over Judah in the fourth year of Ahab king of Israel.
42 Jehoshaphat was thirty and five years old when he began to reign; and he reigned twenty and five years in Jerusalem. And his mother’s name was Azubah the daughter of Shilhi.