WW1 - The Foreign Minister of Germany, Hermann Muller, seen here signing the Treaty of Versailles. The treaty was signed at he Palace of Versailles on 28th June 1919. It was the most important of the treaties of Paris that ended World War I in 1919/1920. The peace treaty was negotiated between U.S. President Woodrow Wilson, British politician David Lloyd George, French Statesman Georges Benjamin Clemenceau and the Italian Prime Minister, Vittorio Emanuele Orlando. They were known as 'The Big Four'.