1 In the eighteenth year of the reign of Jeroboam, Abia began to reign over Juda.
2 Chronicles 13:1 Cross References - Thomson
1 Kings 15:1-8
1 In the eighteenth year of the reign of Jeroboam son of Nabat, Abiou, son of Roboam began to reign over Juda,
2 and reigned three years in Jerusalem. His mother's name was Maacha, a grand daughter of Abessalom.
3 And he walked in the sins of his father which he had committed in his sight, and his heart, like the heart of his father, was not perfect before the Lord his God.
4 Nevertheless for the sake of David, the Lord gave him surviving issue that he might establish his children after him, and establish Jerusalem,
5 as David had done what was right in the sight of the Lord, and had not deviated all the days of his life from all that he commanded him.
6 [Omitted]
7 Now the rest of the acts of Abiou and all that he did, behold are they not written in the journal of the kings of Juda? for the war continued between Abiou and Jeroboam.
8 And Abiou went to rest with his fathers in the twentieth year of the reign of Jeroboam, and was buried with his fathers in the city of David, and Asa his son reigned in his stead.
2 Chronicles 12:16
16 for there was a war between him and Jeroboam continually. And when Roboam died he was buried with his fathers in the city of David, and Abia his son reigned in his stead.