Historical

League of Nations - came out of the peacemaking in Paris in 1919.

Covenant of the League of Nations.

Henry IV of France was successfully aided by his chief minister - Maximilien de Bethune, Duc de Sully. https://en.wikipedia.org/wiki/Maximilien_de_B%C3%A9thune%2C_Duke_of_Sully "Perhaps among his most famous works was the idea of a Europe composed of 15 roughly equal states, under the direction of a "Very Christian Council of Europe", charged with resolving differences and disposing of a common army. This famous "Grand Design," a utopian plan for a Christian republic, is often cited as one of the first grand plans and ancestors for the European Union."

The Holy Alliance of 1815.

the Concert of Europe.

Postal, railway, port and shipping arrangements, the combating of disease and the slave trade, the regulation of international rivers and waterways, were tackled successfully in the 1800s, despite international rivalries.

Hague Conference of 1899.

Permanent Court of Arbitration.

League to Enforce Peace.

League of Nations Society

League of Nations Union

Phillimore Committee of 1918, chaired by Sir Walter Phillimore (a high court judge), investigated "particularly from a judicial and historical point of view" the background and feasibility of earlier peace council proposals. In 1917 Sir Walter Phillimore had published a study of the historical precedents and advanced his own plan for a 'league of nations'. http://en.wikipedia.org/wiki/Walter_Phillimore,_1st_Baron_Phillimore