He ended the war of Spartacus and the final revolt of Mithridates VI, but his military success came to an end approximately fifteen years later when he fought to a draw at Dyrrachium and was crushed at Pharsalus in 48 BC by his greatest rival.  
His early successes included the defeat of Domitius Ahenobarbus and King Iarbas in Africa.  He reinforced Caecilius Metellus Pius against Sertorius in Spain and the lex Gabinia gave him a special command against Mediterranean pirates.  He ended the war of Spartacus and the final revolt of Mithridates VI, but his military success came to an end approximately fifteen years later when he fought to a draw at Dyrrachium and was crushed at Pharsalus in 48 BC by his greatest rival.  FTP, name this member of the first triumvirate and chief rival of Julius Caesar.
His early successes included the defeat of Domitius Ahenobarbus and King Iarbas in Africa.  
Pompey the Great or Gnaeus Pompeius Magnus.