We need to allow a brief co-regency of Jehoshaphat with his sick and aged father, King Asa, when the new Israelite king, Ahab, may have posed a threat to Judah. It is significant that the two most competent scholars on Hebrew monarchy chronology, E.R. Thiele and Gershon Galil, both come to this same basic date of 931/930 B.C., from two quite independent approaches. See Thiele, The Mysterious Numbers of the Hebrew Kings, 3rd ed. (Grand Rapids, MI: Eerdmans, 1986); and Galil, The Chronology of the Kings of Israel and Judah (Leiden: E.J. Brill, 1996).