As an example of the reasoning that finds inconsistencies in calculations when coregencies are "a priori" ruled out, 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. 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, 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. This dating would be confirmed by the account of Hezekiah's illness in chapter 20, which immediately follows Sennacherib's departure (). This would date his illness to Hezekiah's 14th year, which is confirmed by Isaiah's statement () 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.