So the king of Israel and Jehoshaphat king of Judah went up to Ramoth-gilead.

1 Kings 4:13
Ben-geber in Ramoth-gilead (the villages of Jair son of Manasseh in Gilead belonged to him, as well as the region of Argob in Bashan with its sixty great cities with walls and bronze bars);

2 Chronicles 18:27
But Micaiah replied, "If you ever return safely, the LORD has not spoken through me." Then he added, "Take heed, all you people!"

2 Chronicles 18:29
And the king of Israel said to Jehoshaphat, "I will disguise myself and go into battle, but you wear your royal robes." So the king of Israel disguised himself and went into battle.

So the king of Israel and Jehoshaphat the king of Judah went up to Ramothgilead.