Abijam reigned — So his reign began with Jeroboam's eighteenth year, continued his whole nineteenth year, and ended within his twentieth year, in which also Asa's reign began. And thus one and the same year may be attributed to two several persons.
Related Commentaries of 1 Kings 15:1
1 Kings 15:1
1 Now in the eighteenth year of king Jeroboam the son of Nebat reigned Abijam over Judah.