So he died according to the word of the LORD which Elijah had spoken. And Jehoram reigned in his stead in the second year of Jehoram the son of Jehoshaphat king of Judah; because he had no son.
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George Leo Haydock
The second year of Joram, counted from the time that he was associated to the throne of his father Josaphat; (Challoner) so that it is said that he reigned also in the 18th year of Josaphat, chap. iii. 1. See also chap. viii. 16. To obviate these apparent contradictions, chronologists suppose that Joram reigned over Israel in the 18th of Josaphat, king of Juda, and in the second year after the latter had appointed his son Joram viceroy. He was associated with his father on the throne two years before his death, and in the 5th of Joram, king of Israel. Examples of this kind are frequent among the Hebrews, and particularly among the Persians, whose chronology is thus rendered very difficult. Why should we allow that the numbers are erroneous, when this explanation will suffice? (Calmet)
Grotius leaves the matter undecided. (Du Hamel)
Capel (Crit. p. 414.) maintains that the numbers have been ill transcribed; and so does Houbigant, who asserts that such a mode of writing would not be to...