These verses interrupt the account of the church officers in the time of Joiakim, resumed in Nehemiah 12:24. They appear to be an addition to the original text, made about the time of Alexander the Great, when the Books of Chronicles, Ezra, and Nehemiah would seem to have first taken their existing shape. The same writer who introduced these verses, probably also added Nehemiah 12:11 to the original text.
Darius the Persian - Probably Darius Codomannus (336-331 B.C.), the antagonist of Alexander the Great. See the introduction of the Book of Nehemiah.
This passage shows that the practice of keeping a record of public events in state archives was continued after the return from the captivity, at least to the time of Johanan, the son, i. e., “the grandson,” of Eliasbib.