Kings of Judah

Additional potential confusion arises from periods of co-regency when a son's reign may begin prior to the end of his father's reign. In those situations, years of reign are specified in terms of both the father and of the son. At times, the period of co-regency is clearly indicated, while in others it must be inferred from the source material.

As an example of the reasoning that finds inconsistencies in calculations when coregencies are a priori ruled out, 2 Kings 18:10 dates the fall of Samaria (the Northern Kingdom) to the 6th year of Hezekiah's reign. William F. Albright dated the fall of the Kingdom of Israel to 721 BC, whereas E. R. Thiele calculated the date as 723 BC.[9] If Albright's or Thiele's dating are correct, then Hezekiah's reign would begin in either 729 or 727 BCE. On the other hand, 18:13 states that Sennacherib invaded Judah in the 14th year of Hezekiah's reign. Assyrian records date this invasion to 701 BC, and Hezekiah's reign would therefore begin in 716/715 BC.[10] This dating would be confirmed by the account of Hezekiah's illness in chapter 20, which immediately follows Sennacherib's departure (2 Kings 20). This would date his illness to Hezekiah's 14th year, which is confirmed by Isaiah's statement (2 Kings 18:5) that he would live fifteen more years (29−15=14). These problems are all addressed by scholars who make reference to the ancient Near Eastern practice of coregency.

Following the approach of Wellhausen, another set of calculations shows it is probable that Hezekiah did not ascend the throne before 722 BCE. By Albright's calculations, Jehu's initial year was 842 BC; and between it and Samaria's destruction the Books of Kings give the total number of the years the kings of Israel ruled as 143 7/12, while for the kings of Judah the number is 165. This discrepancy, amounting in the case of Judah to 45 years (165−120), has been accounted for in various ways; each of those positions must allow for Hezekiah's first six years to have fallen before 722 BCE. (However, Hezekiah beginning to reign before 722 BCE is consistent with a co-regency of Ahaz and Hezekiah from 729 BC.) Nor is it clearly known how old Hezekiah was when called to the throne; although 2 Kings 18:2 states that he was twenty-five years of age, his father died at the age of thirty-six (2 Kings 16:2) and it is not likely that Ahaz had a son at the age of eleven. Hezekiah's son Manasseh ascended the throne twenty-nine years later, at the age of twelve. This places his birth in the seventeenth year of his father's reign, suggesting Hezekiah's age as forty-two, if he was twenty-five at his ascension. It is more probable that Ahaz was twenty-one or twenty-five when Hezekiah was born (suggesting an error in the text), and that the latter was thirty-two at the birth of his son and successor, Manasseh.

Since Albright and Friedman, several scholars have explained these dating problems on the basis of a co-regency between Hezekiah and his father Ahaz between 729 and 716/715 BCE. Assyriologists and Egyptologists recognize that co-regency was practiced in both Assyria and Egypt.[11][12] After noting that co-regencies were used sporadically in the northern kingdom (Israel), Nadav Na'aman writes,

In the kingdom of Judah, on the other hand, the nomination of a co-regent was the common procedure, beginning from David who, before his death, elevated his son Solomon to the throne.... When taking into account the permanent nature of the co-regency in Judah from the time of Joash, one may dare to conclude that dating the co-regencies accurately is indeed the key for solving the problems of biblical chronology in the eighth century B.C."[13]

Among the numerous scholars who have recognized the co-regency between Ahaz and Hezekiah are Kenneth Kitchen,[14] Leslie McFall[15] and Jack Finegan.[16] McFall, in his 1991 article, argues that if 729 BCE (that is, the Judean regnal year beginning in Tishri of 729) is taken as the start of the Ahaz/Hezekiah co-regency, and 716/715 BCE as the date of the death of Ahaz, then all the extensive chronological data for Hezekiah and his contemporaries in the late eighth century BCE are in harmony. Further, McFall found that no textual emendations are required among the numerous dates, reign lengths, and synchronisms given in the Bible for this period.[17] In contrast, those who do not accept the Ancient Near Eastern principle of co-regencies require multiple emendations of the biblical text, and there is no general agreement on which texts should be emended, nor is there any consensus among these scholars on the resultant chronology for the eighth century BCE. This is in contrast with the general consensus among those who accept the biblical and near Eastern practice of co-regencies that Hezekiah was installed as co-regent with his father Ahaz in 729 BC, and the synchronisms of 2 Kings 18 must be measured from that date, whereas the synchronisms with Sennacherib are measured from the sole reign starting in 716/715 BCE. The two synchronisms to Hoshea of Israel in 2 Kings 18 are then in agreement with the dates of Hoshea's reign that can be determined from Assyrian sources, as is the date of Samaria's fall as stated in 2 Kings 18:10. An analogous situation of two ways of measurement, both equally valid, is encountered in the dates given for Jehoram of Israel, whose first year is synchronized to the 18th year of the sole reign of Jehoshaphat of Judah in 2 Kings 3:1 (853/852 BC), but his reign is also reckoned according to another method as starting in the second year of the coregency of Jehoshaphat and his son Jehoram of Judah (2 Kings 1:17); both methods refer to the same calendar year.

Scholars who accept the principle of co-regencies note that abundant evidence for their use is found in the biblical material itself.[18] The agreement of scholarship built on these principles with both biblical and secular texts was such that the Thiele/McFall chronology was accepted as the best chronology for the kingdom period in Jack Finegan's encyclopedic Handbook of Biblical Chronology.[19]

The Babylonian Chronicles give 2 Adar (16 March), 597 BC, as the date that Nebuchadnezzar first captured Jerusalem, thus putting an end to the reign of Jehoaichin.[20] Zedekiah's installation as king by Nebuchadnezzar can thus be dated to the early spring of 597 BC.

Historically, there has been considerable controversy over the date when Jerusalem was captured the second time and Zedekiah's reign came to an end. There is no dispute about the month, the summer month of Tammuz (Jeremiah 52:6). However, regarding the year, Albright preferred 587 BCE and Thiele advocated 586 BC, and this division among scholars has persisted until the present time. If Zedekiah's years are by accession counting, whereby the year he came to the throne was considered his "zero" year and his first full regnal year, 597/596, was counted as year one, Zedekiah's eleventh year, the year the city fell, would be 587/586. Since Judean regnal years were measured from Tishri in the fall, this would place the end of his reign and the capture of the city in the summer of 586 BCE. Accession counting was the rule for most, but not all, of the kings of Judah, whereas "non-accession" counting was the rule for most, but not all, of the kings of Israel.[4][21]

The publication of the Babylonian Chronicles in 1956, however, gave evidence that the years of Zedekiah were measured in a non-accession sense. This reckoning makes 598/597 BC, the year Zedekiah was installed by Nebuchadnezzar according to Judah's Tishri-based calendar, to be year "one", so that the fall of Jerusalem in his eleventh year would have been 588/587 BC, i.e. in the summer of 587 BCE. The Bablyonian Chronicles fairly precisely date the capture of Jehoiachin and the start of Zedekiah's reign, and they also give the accession year of Nebuchadnezzar's successor Amel-Marduk (Evil Merodach) as 562/561 BC, which was the 37th year of Jehoiachin's captivity according to 2 Kings 25:27. These Babylonian records related to Jehoiachin's reign are consistent with the fall of the city in 587 but not in 586, vindicating Albright's reckoning.

Further potential confusion arises from the convention of dating reigns of the Israelite kings in reference to the Gregorian calendar. Years in the Gregorian calendar commence on 1 January, whereas year numbers for dating biblical events start on 1 Tishri of the Hebrew calendar, with an unfixed starting point during September–October on the Gregorian calendar. Accordingly, an event which takes place after 1 Tishri, for example, in November and December on the Gregorian calendar, would fall in the following year in the Hebrew calendar used for biblical dating.