Here are two list of box office results between the year 1957 to 1959. It's cool to see the ranking of HERCULES at #7 for 1957/1958 period. THE TEN COMMANDMENTS is number one but HERCULES cost a fraction of what the Cecil b DeMille super-production cost and was also in the top ten. THE MIGHTY CRUSADERS is at #20 for that period which is also cool to see. The film also stars Sylva Koscina and Gianna Maria Canale from HERCULES.
As for the period between 1958/1959, HERCULES UNCHAINED is at #10 proving that the Francisci's HERCULES films were BIG not only in the US but in Italy and around the world. The Catherine The Great Italian costume drama THE TEMPEST is at #1, THE VIKINGS at #5 and most remarkably the messy SIGN OF THE GLADIATOR is at # 13.
Note that Sylva Koscina and Silvana Mangano have multiple titles listed and Gianna Maria Canale and Gina Lollobrigida are also listed but no Sophia Loren titles. I find this interesting.