His name is Jehu.
The story of Jehu is told in 2 Kings chapters 9 and 10, where God, through the prophet Elisha, anoints Jehu as king and commands him to perform a series of serial killings. First he is told to kill everyone in Ahab's family, especially all those who have ever "pissed against a wall."
Thus saith the LORD God ... thou shalt smite the house of Ahab ... For the whole house of Ahab shall perish: and I will cut off from Ahab him that pisseth against the wall. 2 Kings 9:7-9
So Jehu rides off in his chariot to kill Ahab's son, Jehoram -- a wall pisser if ever there was one.
After killing Jehoram, Jehu killed Ahab's wife, Jezebel, whom God wanted not just dead, but treated like shit and fed to the dogs.
And the dogs shall eat Jezebel in the portion of Jezreel, and there shall be none to bury her. 9:10
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