2 Kings 15:30
30. Hoshea the son of Elah made a conspiracy . . . and slew him—He did not, however, obtain possession of the kingdom till about nine or ten years after the perpetration of this crime [HALES].
in the twentieth year of Jotham—Jotham's reign lasted only sixteen years, but the meaning is that the reign of Hoshea began in the twentieth after the beginning of Jotham's reign. The sacred historian, having not yet introduced the name of Ahaz, reckoned the date by Jotham, whom he had already mentioned (see 2Ch 27:8).2Ki 15:32-38. JOTHAM'S REIGN OVER JUDAH.
2 Kings 16:9
7-9. So Ahaz sent messengers to Tiglath-pileser—In spite of the assurance given him by Isaiah by two signs, the one immediate, the other remote (Isa 7:14; 8:4), that the confederate kings would not prevail against him, Ahaz sought aid from the Assyrian monarch, to purchase which he sent the treasures of the palace and temple. Tiglath-pileser marched against Damascus, slew Rezin the king, and carried the people of Damascus into captivity to Kir, which is thought to have been the city Karine (now Kerend), in Media.