4.
“In the three and twentieth year of Joash the son of Ahaziah king of Judah, Jehoahaz the son of Jehu began to reign over Israel” (2 Kings xiii, 1).
From the death of Ahaziah king of Israel to the accession of Jehoahaz, Jehoram reigned 12 years, and Jehu 28 years, a total of 40 years.
From the death of Jehoshaphat to the accession of Jehoahaz, Judah’s sovereigns reigned—Joram 8 years, Ahaziah 1 year, Athaliah 6 years, Joash 23 years. 8 years + 1 year + 6 years + 23 years = 38 years.
If from the death of Ahaziah to the accession of Jehoahaz was forty years, and from the death of Jehoshaphat to the accession of Jehoahaz was thirty-eight years, Jehoshaphat therefore died two years after Ahaziah died.