Vincere 1 (in French : conquer ) is a film by Marco Bellocchio released onin Italy and presented in official competition at the 2009 Cannes Film Festival . A biographical film about Benito Mussolini and the rise of Italian fascism , Bellocchio chooses to portray his historical fresco in terms of the life of Duce’s mistress, Ida Dalser , and their adulterous son.