2 Kings 9:29

And in the eleventh year of Joram the son of Ahab began
Ahaziah to reign over Judah.
] In ( 2 Kings 8:25 ) , it is said to be in the twelfth year of his reign; it was at the close of the eleventh, and the beginning of the twelfth; or he began to reign with his father in the eleventh as here, and in the twelfth as there, when his father was dead.