Which is the correct date for the commencement of king Hezekiah of the Southern Kingdom of Judah?

A booklet giving a helpful chart on the various kings post-Solomon, says **king Hezekiah started to reign over Judah in 715 B.C.** On the corresponding chart for the kings of the Northern Kingdom of Israel, it details its last king, Hoshea, as reigning from 733 to 722. Then, when starting to read 2 Kings chapter 18, I noted that it said: > “Now it came to pass in the third year of Hoshea son of Elah king of > Israel, that Hezekiah the son of Ahaz king of Judah began to reign. > Twenty and five years old was he when he began to reign; and he > reigned twenty and nine years in Jerusalem.” 2 Kings 18:1-2 K.J.V. However, according to the chart in *A Concise Chronology of the Bible*, (John D. Brand, p.31, Edinburgh Bible College, 2014), **the third year of Hoshea’s reign would be 729/30, not 715**. So, which of those two dates is correct, or are they both correct if there were issues of co-regency involved? ***As an aside,*** the Hebrew scriptures speak of the 10-tribe kingdom of Israel, and the 2-tribe kingdom of Judah, Benjamin being that second one, as in 2 Chronicles 11:1. Yet the tribe of Benjamin never seems to be mentioned as that second tribe thereafter. Or have I missed a later verse about that?