Matthew Poole and continuators on 1 Kings 14:21

21 ¶ And Rehoboam the son of Solomon reigned in Judah: Rehoboam was forty and one years old when he began to reign, and he reigned seventeen years in Jerusalem, the city which the LORD did chuse out of all the tribes of Israel, to put his Name there: and his mothers name was Naamah, an Ammonitess .

Therefore he was born a year before Solomon was King, as appears from 1 King. 11. 42. This is noted as an aggravation of Rehoboam's folly, that he was old enough to have been wiser.

A People Cursed by God, and shut out of the Congregation of his People for ever, Deut. 23. 3. Neh. 13. 1. This is observed as one cause both of Gods displeasure in punishing Solomon with such a Son, and of Rehoboam's Apostacy after his three first years, 2 Chron. 11. 17.

Marginal references: 2 Chr. 12. 13.