French -trained Treve wins Prix de l'Arc de Triomphe . Treve is only the seventh horse to win successive Arcs and the first since the Vincent O'Brien-trained Alleged was ridden to a 1978 success by legendary English jockey Lester Piggott . first horse in three-year-old to win back to back Arcs . three -1 shot Arcs given perfect ride by jockey Andre Fabre 's . Japanese challenge never materializes .
French -trained Treve wins Prix de l'Arc de Triomphe . first horse in three-year-old to win back to back Arcs . three -1 shot Arcs given perfect ride by jockey Andre Fabre 's . Japanese challenge never materializes .