Agreement of Saint-Jean-de-Maurienne
The Agreement of St.-Jean-de-Maurienne was an agreement between France, Italy and Great Britain, which emanated from a conference in a railway car at Saint-Jean-de-Maurienne on 19 April 1917 and signed by the allies between 18 August and 26 September 1917. The 19 April meeting was attended by British and French Prime Ministers, David Lloyd George and Alexandre Ribot, and the Italian Prime Minister and Foreign Minister, Paolo Boselli and Sidney Sonnino.
Source: Wikipedia — Agreement of Saint-Jean-de-Maurienne (CC BY-SA 4.0)