2 Kings 1:17

And Jehoram reigned in his stead, in the second year of Jehoram the son of Jehoshaphat— His brother Jehoram reigned in his stead, because he had no son. To avoid confusion, the reader should take notice, that in the course of this history there is mention made of two Jehorams; one, the second son of Ahab, who succeeded Ahaziah, and wasking of Israel; the other, son and heir to Jehoshaphat, who reigned in Judah. By comparing chap. Exodus 3:1 and chap. 2 Kings 8:16 a great difference in the reading of the dates will appear. We should just remark, however, that it is commonly supposed, that Jehoshaphat declared his son Jehoram king while himself was alive, and reigned in conjunction with him for the space of seven years; a supposition which, if allowed, will in some degree clear up the difficulty. See Archbishop Usher's Annals, sub A.M. 3106.