The Covenant of the League of Nations was the charter of the League of Nations. It was signed on 28 June 1919 as Part I of the Treaty of Versailles, and became effective together with the rest of the Treaty on 10 January 1920. Early drafts for a possible League of Nations began even before the end of the First World War. The London-based Bryce Group made proposals adopted by the British League of Nations Society, founded in 1915. Another group in the United States—which included Hamilton Holt and William B. Howland at the Century Association in New York City—had their own plan. This plan was largely supported by the League to Enforce Peace, an organization led by former U.S. President William Howard Taft. In December 1916, Lord Robert Cecil suggested that an official committee be set up to draft a covenant for a future league. The British committee was finally appointed in February 1918; it was led by Walter Phillimore (and became known as the Phillimore Committee) but also included Eyre Crowe, William Tyrrell, and Cecil Hurst. U.S. President Woodrow Wilson was not impressed with the Phillimore Committee's report, and would eventually produce three draft covenants of his own with help from his friend Colonel House. At least one of Wilson's drafts was reportedly based on a proposal to establish a "league of nations" that was written by American peace activist Mary Shapard. Further suggestions were made by Jan Christiaan Smuts in December 1918. At the Paris Peace Conference in 1919, a commission was appointed to agree on a covenant. Members included Woodrow Wilson (as chair), Colonel House (representing the U.S.), Robert Cecil and Jan Smuts (British Empire), Léon Bourgeois and Ferdinand Larnaude (France), Prime Minister Vittorio Orlando and Vittorio Scialoja (Italy), Foreign Minister Makino Nobuaki and Chinda Sutemi (Japan), Paul Hymans (Belgium), Epitácio Pessoa (Brazil), Wellington Koo (China), Jayme Batalha Reis (Portugal), and Milenko Radomar Vesnitch (Serbia). Further representatives of Czechoslovakia, Greece, Poland and Romania were later added.