1 Kings 15:9 in the King James Version
And in the twentieth year of Jeroboam king of Israel reigned Asa over Judah.
Context
8 Abijam slept with his fathers, and they buried him in David’s city; and Asa his son reigned in his place.
9 In the twentieth year of Jeroboam king of Israel, Asa began to reign over Judah.
10 He reigned forty-one years in Jerusalem. His mother’s name was Maacah the daughter of Abishalom.