“Now Jehoram the son of Ahab began to reign over Israel in Samaria in the eighteenth year of Jehoshaphat king of Judah” (2 Kings iii, 1).
If Ahaziah died and Jehoram became king in the eighteenth year of Jehoshaphat’s reign, Jehoshaphat therefore died seven years after Ahaziah died.
11.
“In the second year of Pekah the son of Remaliah king of Israel began Jotham the son of Uzziah [Azariah] king of Judah to reign” (2 Kings xv, 32).
From the death of Ahaziah to the beginning of Jotham’s reign the following were the reigns of Israel’s kings: Jehoram 12 years, Jehu 28 years, Jehoahaz 17 years, Joash 16 years, Jeroboam 41 years, Zachariah and Shallum 1 year, Menahem 10 years, Pekahiah 2 years, Pekah 2 years. 12 years + 28 years + 17 years + 16 years + 41 years + 1 year + 10 years + 2 years + 2 years = 129 years.
From the death of Jehoshaphat to the beginning of Jotham’s reign the following were the reigns of Judah’s kings: Joram 8 years, Ahaziah 1 year, Athaliah 6 years, Joash 40 years, Amaziah 29 years, Azariah 52 years. 8 years + 1 year + 6 years + 40 years + 29 years + 52 years = 136 years.
If from the death of Ahaziah to the beginning of Jotham’s reign was one hundred and twenty-nine years, and from the death of Jehoshaphat to the beginning of Jotham’s reign was one hundred and thirty-six years, Jehoshaphat therefore died seven years before Ahaziah died.