'King of Judah' in the Bible

"Tell Solomon's son Rehoboam, king of Judah and all of Israel in Judah and Benjamin:

The residents of Jerusalem made Jehoram's son Ahaziah king in his place after the raiding party that had invaded the city with the Arabs had killed all of the older sons. That's how Jehoram's son Ahaziah became king of Judah.

Joash's son Amaziah, king of Judah, lived for fifteen years after the death of Jehoahaz' son Joash, king of Israel.

"This is what the LORD God of Israel says: "Tell the man who sent you to me, "This is what the LORD says: "Pay attention! I'm bringing evil to visit this place and its inhabitants every single curse written in the book that they've been reading to the King of Judah.

"Now tell the king of Judah who sent you to ask the LORD about this: "This is what the LORD God of Israel says about what you've heard:

But he sent messengers to him, who asked him, "What do we have in common, King of Judah? I am not here today opposing you. I am fighting the dynasty that is fighting me, and God has ordered me to hurry. For your own good, stop interfering with God, who is with me, and he won't destroy you!"