began to reign. In the third year of Hoshea, king of Israel. Therefore in the last year but one of his father's reign. Hezekiah began his reformation in 616, the first year of his sole reign. See App-50.
Abijah. In 2 Kings 18:2 it is given as 'Abi, here it is 'Abijah. But the "I" in the former stands for the abbreviation of "jah" in the latter.