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Ishbosheth was a son of Saul. After Saul’s death, David went to Hebron and became king of the tribe of Judah (son of Jacob), while Ishbosheth who was a descendant of Benjamin became king of the rest of the tribes of Israel. After Ishbosheth’s general Abner left him to join David, Ishbosheth’s servants cut his head off and gave it to David. So David executed them for murdering their king.