in the eleventh
2 Kings 8:16,24 And in the fifth year of Joram the son of Ahab king of Israel, Jehoshaphat being then king of Judah...
2 Chronicles 21:18,19 And after all this the LORD smote him in his bowels with an incurable disease...
2 Chronicles 22:1,2 And the inhabitants of Jerusalem made Ahaziah his youngest son king in his stead...
began Ahaziah. `Then he began to reign as viceroy to his father in his sickness.'
But in Joram's twelfth year, he began to reign alone
2 Kings 8:25 In the twelfth year of Joram the son of Ahab king of Israel did Ahaziah the son of Jehoram king of Judah begin to reign.