Talks between the Allies to establish a common negotiating position started on 18 January 1919, in the Salle de l'Horloge at the French Foreign Ministry on the Quai d'Orsay in Paris.
Initially, 70 delegates from 27 nations participated in the negotiations.
Russia was excluded due to their signing of a separate peace (the Treaty of Brest-Litovsk) and early withdrawal from the war.
Furthermore, German negotiators were excluded to deny them an opportunity to divide the Allies diplomatically.

Initially, a "Council of Ten" (comprising two delegates each from Britain, France, the United States, Italy, and Japan) met officially to decide the peace terms.
This council was replaced by the "Council of Five", formed from each country's foreign ministers, to discuss minor matters.
French Prime Minister  Georges Clemenceau, Italian Prime Minister Vittorio Emanuele Orlando, British Prime Minister David Lloyd George, and United States President Woodrow Wilson formed the "Big Four" (at one point becoming the "Big Three" following the temporary withdrawal of Vittorio Emanuele Orlando).
These four men met in 145 closed sessions to make all the major decisions, which were later ratified by the entire assembly.
The minor powers attended a weekly "Plenary Conference" that discussed issues in a general forum but made no decisions.
These members formed over 50 commissions that made various recommendations, many of which were incorporated into the final text of the treaty.
Talks between the Allies to establish a common negotiating position started on 18 January 1919, in the Salle de l'Horloge at the French Foreign Ministry on the Quai d'Orsay in Paris. Initially, 70 delegates from 27 nations participated in the negotiations. Russia was excluded due to their signing of a separate peace (the Treaty of Brest-Litovsk) and early withdrawal from the war. Furthermore, German negotiators were excluded to deny them an opportunity to divide the Allies diplomatically.
Initially, a "Council of Ten" (comprising two delegates each from Britain, France, the United States, Italy, and Japan) met officially to decide the peace terms. This council was replaced by the "Council of Five", formed from each country's foreign ministers, to discuss minor matters. French Prime Minister  Georges Clemenceau, Italian Prime Minister Vittorio Emanuele Orlando, British Prime Minister David Lloyd George, and United States President Woodrow Wilson formed the "Big Four" (at one point becoming the "Big Three" following the temporary withdrawal of Vittorio Emanuele Orlando). These four men met in 145 closed sessions to make all the major decisions, which were later ratified by the entire assembly. The minor powers attended a weekly "Plenary Conference" that discussed issues in a general forum but made no decisions. These members formed over 50 commissions that made various recommendations, many of which were incorporated into the final text of the treaty.
Treaty of Versailles