This fits well with the idea that Manasseh started going astray at age 27 after his fathers death, for it allows him 13 years to develop into such as wicked person so as to cause his son to pass through the fire at about age 40.
The language used is similar to that of the other cases of succession to the throne recorded in the bible, yet it is not likely that the sons were only enthroned after their fathers died, rather they would have been enthroned during their fathers lifetime, when their fathers sensed that death was near.
Unfortunately, none of the above theories of how many invasions happened, in any way solves the problem of chronology regarding Sennacherib being called king of Assyria and having his first or only campaign in Hezekiahs 14 year, the bible provides a total of 133 years 6 months and 10 days, or roughly 134 years between the deportation of Judah in 586 and the deportation of the Northern kingdom of Israel which is thus placed in 720 (a one year variance with modern scholarship).
Since these two were brothers and since the firstborn was the normal heir to the throne, some time must have passed for Jehoiakim to reach an older age upon his ascension than that of his older brother Jehoahaz, when he was placed on the throne.
The Biblical account has been shown to be the correct one by comparison to the Babylonian Chronicle, which is a record of annual events begun in the middle of the eighth century BC.
(Shanks p172) Here again reliance on the Assyrian records to date events in the ancient near East is entirely misleading.
The difference between their birthdates need not be great if they were born to different wives.
For they could not keep it at the regular time, because a sufficient number of priests had not consecrated themselves, nor had the people gathered together at Jerusalem So they resolved to make a proclamation throughout all Israel, from Beersheba to Dan The placement of Hezekiahs Passover of his first year in the period preceding the deportation of the Northern tribes is internal evidence that he was in power before 721BC and thus supports the other straight forward claims to such by the biblical writers.
We have no Assyrian historical records from Shalmaneser 5ths reign, but the general sequence of events can be reconstructed from the Eponym Chronicle, itself poorly preserved at this point, in combination with information that survives third-hand from the annals of Tyre.If Hezekiahs sickness happened at the end of his 29 year reign it would have been when he was about 54 years old.If his lifespan was extended 15 years from this point he would have lived to age 69, or allowing for partial years being added to each of these rounded figures, he would have lived to the full 70 years.Yet a larger problem remains: It seems that for the author to refer to Sennacheribs death as being part of the way the LORD saved Hezekiah, that his death must have been in Hezekiahs lifetime, otherwise this statement would seem illogical.Additionally the Assyrian account agrees with the biblical account in that it specifically excludes Jerusalem as having been captured, though this would fit into the biblical scenario at any point since the Assyrians never captured Jerusalem at any time.