2019 marks the 100-year anniversary of the founding of the League of Nations. The choice of the city of Geneva as this international organisation’s seat was not accidental. Since the 19th century, Switzerland had been one of the most active pioneers of «internationalism». As of 1919, the League of Nations provided this multilateral diplomacy with a new dimension. The research centre Dodis takes a closer look at the Swiss contribution to the construction of the multilateralism.