At the suggestion of Czar Nicholas II of Russia, the First International Peace Conference was held in The Hague. 26 nations attended.
Although the conference failed to achieve its primary objective, the limitation on armaments, it did adopt conventions defining the state of belligerency and adopted the Convention for the Pacific Settlement of International Disputes thus creating the Permanent Court of Arbitration. [Encyclopaedia Britannica]
The Second Peace Conference in The Hague was attended by the representatives of 44 states. Again the proposal for the limitation of armaments was not accepted. The conference did, however, adopt several conventions relating to comportment of nations in time of war. It was resolved to hold another conference in eight years and although the conference scheduled for 1915 failed to meet because of the outbreak of World War I, the conference idea strongly influenced the creation of the more highly organized League of Nations after the war. [Encyclopaedia Britannica]