2 Kings 9:13-17

Then they hurried, and each man took his garment and put it under him on the bare steps, and blew the trumpet, saying, “Jehu is king!” Jehu Assassinates Jehoram (Joram)

So Jehu the son of Jehoshaphat the son of Nimshi conspired against Joram. Now Joram with all Israel was defending Ramoth-gilead against Hazael king of Aram,

but King Joram had returned to Jezreel to have himself healed of the wounds which the Arameans had inflicted on him when he fought Hazael king of Aram. So Jehu said to the other men, “If this is your intent, then let no one escape from the city to go tell about it in Jezreel.”

Then Jehu rode in a chariot and went to Jezreel, since Joram was lying there recovering. And Ahaziah the king of Judah had come down to see Joram.

Now the watchman was standing on the tower in Jezreel and he saw the company of Jehu as he came, and he said, “I see a company.” And Joram said, “Take a horseman and send him to meet them and have him ask, ‘Is your intention peace?’ ”