Cinna was killed upon rumors of involvement in the
Cinna was killed upon rumors of involvement in the death of this man, who turned out to be alive and went on to retake North Africa on behalf of Sulla. His ally Aulus Gabinius appointed him commander of an anti-pirate force, though this man's son (*) Sextus later became a pirate himself. This defeater of Tigranes and Mithridates was eventually killed in Egypt after fleeing Pharsalus. For 10 points—  name this ally, then rival, of Caesar.
Cinna was killed upon rumors of involvement in the death of this man, who turned out to be alive and went on to retake North Africa on behalf of Sulla.
Pompey the Great or Gnaeus Pompeius Magnus