In the eighteenth year of Jeroboam’s reign, Abijah became king of Judah,
Abijah's mother was called Maachah, the daughter of Absalom, Ch2 11:20; here she is called Michaiah, the daughter of Uriel. It is most probable that she was a grand-daughter of Absalom, by his daughter Tamar (Sa2 14:27), and that her immediate father was this Uriel. But we are here to attend Abijah into the field of battle with Jeroboam king of Israel. I.
Commenting on 2 Chronicles 13:1-12
Now in the eighteenth year of King Jeroboam began Abijah to reign over Judah.; see Gill on Kg1 15:1. . 2 Chronicles 13:2 ch2 13:2 ch2 13:2 ch2 13:2He reigned three years in Jerusalem,.... See Gill on Kg1 15:2, his mother's name also was Michaiah the daughter of Uriel of Gibeah; see Ch2 11:20; see Gill on Kg1 15:2.
Now in the eighteenth year of king Jeroboam began Abijah to reign over Judah. (a) He means Judah and Benjamin.