The three Major Powers (Lloyd George, Woodrow Wilson, and Georges Clemenceau) that did most of the talking at the Paris Peace Conference of 1919, add one Vittorio Orlando.

Vittorio Orlando, the leader of Italy at the time, is not considered by many as a fourth "major power". Nether the less, some resources cite the Paris Peace Conference as being talks between four major allies as opposed to the three true allies that were allied from the start.

Italy was not really a Major Power at all. She was a weak country in turmoil with a slow pace of industrialization and a soon-to-be reputation of switching sides during wars.

See: The Big Three