fourth year of Ahab, and Ahab reigned twenty two years, see Kg1 22:41 , and therefore Ahab's son must begin to reign in the eighteenth year of Jehoshaphat; but perhaps he was made king in his father's lifetime, before he went on his expedition to Ramothgilead, or Ahab's reign was not twenty two years complete: and reigned two years over Israel; not complete, as appears from Kg2 3:1 .