Reigned in Judah. This statement illustrates how the reigns of kings are introduced in the official formula. The record of Rehoboam’s visit to Shechem for his coronation and of his hurried retreat to Jerusalem because of the rebellion of the northern tribes has already been given (ch. 12:1-24). Next follows the account of Jeroboam’s reign (chs. 12:25 to 14:20), and now comes the record of Rehoboam’s reign after the official introduction. The records for the kings both of Judah and of Israel for a period till the appearance of Elijah (ch. 17:1) are brief. Supplementary material is, however, found in 2 Chron. 11:1 to 16:14.
Forty and one years old. He must, therefore, have been born before his father, Solomon, came to the throne, since Solomon reigned 40 years (ch. 11:42).
Seventeen years. These were official years, but in this case they were also actual years. The system of reckoning was different in Judah from that in Israel (see on v. 20).
In Judah the remainder of the calendar year during which a king came to the throne was not termed his first year. His first official year was counted from the beginning of the next calendar year.
Naamah an Ammonitess. It is curious that the succession should pass to the son of an earlier wife than the one who was probably Solomon’s chief queen, the daughter of Pharaoh. The reference to the queen mother is usual in the royal annals.