Treaty of London (1915)
London Pact (Italian: Patto di Londra), or more correctly, the Treaty of London, 1915, was a secret pact between the Triple Entente and the Kingdom of Italy. The treaty was signed in London on 26 April 1915 by the United Kingdom of Great Britain and Ireland, the French Third Republic, the Russian Empire, and the Kingdom of Italy. Its intent was to gain the alliance of Italy against its former allies, including German empire and Austro-Hungary.
According to the pact, Italy was to leave the Triple Alliance and join Triple Entente; Italy was to declare war against Germany and Austria-Hungary within a month (this happened against Austria-Hungary within a month, but not until 1916 against Germany). Assuming victory against Germany and its allies, the Triple Entente promised Italy the following territorial gains (see Italia irredenta) at the end of the war:
- Tyrol, up to the Alpine water divide at the Brenner Pass, which includes the modern-day Italian provinces of Trentino and South Tyrol.
- The entire Austrian Littoral, including the port of Trieste and the Cherso-Lussino (Cres-Lošinj) archipelago, but without the island of Krk (Veglia) and the Hungarian port of Fiume (Rijeka).
- Northern Dalmatia, including Zara (Zadar), Sebenico (Šibenik), and most of the Dalmatian islands, except Arbe (Rab) and Brač.
- The districts of Vipava, Idrija and Ilirska Bistrica in the Austrian Duchy of Carniola.
- The townships of Pontebba (Pontafel) and Malborghetto Valbruna (Malborgeth-Wolfsbach) in the Austrian Duchy of Carinthia.
- The Dodecanese Islands (held by Italy since 1912)
- The port of Vlorë in Albania
- A protectorate over Albania ("Italy should be entrusted with the task of representing the State of Albania in its relations with Foreign Powers").
- Parts of the German colonies in Asia and Africa
- In the event of the partition of Turkey, Italy "ought to obtain a just share of the Mediterranean region adjacent to the province of Adalia"
The Kingdom of Serbia, which was not present nor a signatory, was assigned:
- The Dalmatian coast between the Krka and Stagno (Ston), including the Sabbioncello peninsula (Pelješac), the port of Split, and the island of Brazza (Brač).
The Kingdom of Montenegro, which was not present nor a signatory, was assigned:
- The Dalmatian coast between Budua (Budva) and Stagno (Ston), including Ragusa (Dubrovnik) and Bocche di Cattaro (Boka Kotorska), but without the Sabbioncello (Pelješac) peninsula;
- The coast south to the Albanian port of Shengjin (San Giovanni di Medua).
Also, but less precisely, Serbia was assigned:
- Bosnia and Herzegovina
- Slavonia (against Italian objections)
- Some unspecified areas of Albania (to be divided among Serbia, Montenegro, and Greece).
Italy insisted, and the Allies agreed, that the question of the Adriatic coast between Zara and Istria should be settled after the war. Italy also insisted that Serbia should not be informed about the agreements. However, the Allies overruled this by sending an official note to Serbia on 4 August 1915, confirming the post-war territorial claims of Serbia and Montenegro.
Paris Peace Conference
After the war, Italy would only negotiate with Serbia and Montenegro. The Italian delegation staged a walk-out for a number of months when faced with the denial of their territorial demands.
The pact was nullified by the Treaty of Versailles. Before 1918, the contents of the Pact of London had been published to the world by the Bolshevik Russian State. The Fourteen Points, as proposed by U.S. President Woodrow Wilson, contained a number of clauses that argued for ethnic or national self-determination and against respecting the provisions of the Treaty of London:
- Point 1: There should be open covenants of peace, openly arrived at, after which there shall be no private international understandings of any kind but diplomacy shall proceed always frankly and in the public view. ...
- Point 9: There should be a readjustment of the frontiers of Italy to be effected along clearly recognizable lines of nationality.
- Point 11: Serbia, and Montenegro should be evacuated; occupied territories restored...
- Point 12: The Turkish portion of the present Ottoman Empire should be assured a secure sovereignty...
In Wilson's view, the Pact of London had been arrived at by secret contract, hence was not valid. Nevertheless, Wilson had no particular problem with the implementation of other secret wartime agreements such as the Sykes–Picot Agreement. Overall Wilson sought to achieve borders being determined by the populations present in the area rather than by outside parties; the pact of London adjudicated to Italy areas that did not have a majority-Italian population. Wilson believed that Slavic claims to some of the disputed regions were more sound than those of Italy.
Italy ultimately was denied other gains promised in the Treaty: a share of German colonies and control of Albania. Italy tried to establish a physical claim in Anatolia (Turkey), but was quickly forced to evacuate. The partition of the Tyrol on the water divide line was confirmed by the Treaty of St. Germain.
Repercussions of the disavowal of the Treaty
After the war British and French leaders refused to fulfil all the promises in the pact. The irredentist nationalist element of Italy considered this an inexcusable betrayal by these two European allies. The colonial gains by Britain and France from the war further angered the Italians, who felt excluded.
The breakdown of the London Pact helped give rise to a belief in a so-called "mutilated victory" within Italy, which played a role in determining Italian inter-war imperialism. In 1920 Italian nationalists created the Free State of Fiume, although it had not been assigned to Italy in the Treaty of London. This underscored the unstable results of the Treaty of Versailles relative to Italian claims.
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- Treaty of Rapallo (1920)
- Agreement of Saint-Jean-de-Maurienne
- Julian March
- Italian Front (World War I)
- Baker, Ray Stannard. Woodrow Wilson and World Settlement, Volume I Doubleday, Page, and Company, 1923. pages 52–55 
- American Society of International Law. Volume 15, Oxford University Press, 1921, p. 253