Pompey the Great was betrayed stabbed to death in 48 BC by Achillas (one of the guardians of the king of Egypt, Ptolemy XIII Theos Philopator, and commander of the king's troops) Septimius, a Roman soldier.
After he was defeated by Julius Caesar, Pompey fled to Egypt hoping to find sanctuary there because he had been friends with the previous king of Egypt, Ptolemy XII Auletes. Instead, the advisors of the new young king suggested killing him to gain Caesar's favour. When Caesar reached Egypt in his pursuit of Pompey, Pompey's head and seal were presented to him. Caesar was disgusted and put the assassins to death.