
The Constantinople Agreement (also known as the Straits Agreement) was a
secret exchange of diplomatic correspondence between members of the
Triple Entente from 4 March to 10 April 1915 during
World War I
World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
. France and Great Britain promised to give
Constantinople
Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
and the
Dardanelles
The Dardanelles ( ; ; ), also known as the Strait of Gallipoli (after the Gallipoli peninsula) and in classical antiquity as the Hellespont ( ; ), is a narrow, natural strait and internationally significant waterway in northwestern Turkey th ...
, at the time part of the
Ottoman Empire
The Ottoman Empire (), also called the Turkish Empire, was an empire, imperial realm that controlled much of Southeast Europe, West Asia, and North Africa from the 14th to early 20th centuries; it also controlled parts of southeastern Centr ...
, to the
Russian Empire
The Russian Empire was an empire that spanned most of northern Eurasia from its establishment in November 1721 until the proclamation of the Russian Republic in September 1917. At its height in the late 19th century, it covered about , roughl ...
in the event of victory. Britain and France put forward their own claims, to an increased sphere of influence in Persia (now named Iran) for Britain, and to the annexation of
Syria
Syria, officially the Syrian Arab Republic, is a country in West Asia located in the Eastern Mediterranean and the Levant. It borders the Mediterranean Sea to the west, Turkey to Syria–Turkey border, the north, Iraq to Iraq–Syria border, t ...
(including
Palestine
Palestine, officially the State of Palestine, is a country in West Asia. Recognized by International recognition of Palestine, 147 of the UN's 193 member states, it encompasses the Israeli-occupied West Bank, including East Jerusalem, and th ...
) and
Cilicia for France, all sides also agreeing that the governance of the
Holy Places
A sacred space, sacred ground, sacred place, sacred temple, holy ground, holy place or holy site is a location which is regarded to be sacred or hallowed. The sacredness of a Sacred natural site, natural feature may accrue through tradition or ...
and
Arabia
The Arabian Peninsula (, , or , , ) or Arabia, is a peninsula in West Asia, situated north-east of Africa on the Arabian plate. At , comparable in size to India, the Arabian Peninsula is the largest peninsula in the world.
Geographically, the ...
would be under independent
Muslim
Muslims () are people who adhere to Islam, a Monotheism, monotheistic religion belonging to the Abrahamic religions, Abrahamic tradition. They consider the Quran, the foundational religious text of Islam, to be the verbatim word of the God ...
rule. The Greek government was neutral, but in 1915 it negotiated with the Allies, offering soldiers and especially a geographical launching point for attacks on the Turkish Straits. Greece itself
wanted control of Constantinople. Russia vetoed the Greek proposal, because its own main war goal was to control the Straits, and take control of Constantinople.
Though the Allied attempt to seize the area in the
Gallipoli Campaign failed,
Constantinople was nevertheless occupied by the victorious Allies at the end of the war in 1918. By that time, however, the
Russian Revolution
The Russian Revolution was a period of Political revolution (Trotskyism), political and social revolution, social change in Russian Empire, Russia, starting in 1917. This period saw Russia Dissolution of the Russian Empire, abolish its mona ...
had brought about Russian withdrawal from the war, and as it was no longer one of the Allied Powers the agreement was not implemented. Its existence had been revealed by the
Bolshevik
The Bolsheviks, led by Vladimir Lenin, were a radical Faction (political), faction of the Marxist Russian Social Democratic Labour Party (RSDLP) which split with the Mensheviks at the 2nd Congress of the Russian Social Democratic Labour Party, ...
government in 1917.
Historical background

Access to the
Turkish Straits was governed by the 1841
London Straits Convention which stipulated the closure of the straits to warships
and, after the
Crimean War
The Crimean War was fought between the Russian Empire and an alliance of the Ottoman Empire, the Second French Empire, the United Kingdom of Great Britain and Ireland, and the Kingdom of Sardinia (1720–1861), Kingdom of Sardinia-Piedmont fro ...
, by the
Treaty of Paris (1856) which made universal the principle of commercial freedom at the same time as forbidding any militarization in and around the Black Sea, later amended by the
Treaty of London (1871) and reaffirmed in the
Treaty of Berlin (1878)
The Treaty of Berlin (formally the Treaty between Austria-Hungary, France, Germany, Great Britain and Ireland, Italy, Russia, and the Ottoman Empire for the Settlement of Affairs in the East) was signed on 13 July 1878. In the aftermath of the R ...
.
In early 1907, in the talks leading up to the
Anglo-Russian Convention, Count
Alexander Izvolsky, then Russian Minister of Foreign Affairs, raised the question of the Straits, and talks were carried on in London through the Russian ambassador,
Count Alexander Benckendorff. Little is known but the "suggestion appears to have been made that Russia should have free egress from the Black Sea through the Straits, while other powers should have the right to send their vessels of war into the Straits without going into the Black Sea" together with some talk of "Russia's occupying the Bosphorus and England the Dardanelles, after which the Straits might be opened to other warships as well." In the event, nothing came of the discussions at the time.
On 12 October 1908, the Russian Ambassador to France,
Aleksandr Nelidov in a conversation with the British Ambassador to France,
Lord Bertie, said that since Japan would not allow Russia to keep a
Pacific
The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is bounded by the cont ...
fleet, and since the
Baltic was practically closed throughout the winter, it was essential for Russia that the Black Sea should be made "the home for the Russian fleet whence she can move to the Mediterranean, the Baltic and the Far East as necessity may require."
Alexander Izvolsky, the Russian Foreign Minister, in the latter part of 1908 was able to get conditional support for a change in the Straits regime from Austro-Hungarian Foreign Minister
Alois Lexa von Aehrenthal, Italian Minister of Foreign Affairs
Tommaso Tittoni and the German Ambassador to Paris,
Wilhelm von Schoen as well as from Secretary of State for Foreign Affairs
Sir Edward Grey, Grey on 14 October 1908 being clearest on the subject while indicating that Turkish agreement was a prerequisite.
During the
Bosnian Crisis of 1908, in the
Italo-Turkish War
The Italo-Turkish (, "Tripolitanian War", , "War of Libya"), also known as the Turco-Italian War, was fought between the Kingdom of Italy and the Ottoman Empire from 29 September 1911 to 18 October 1912. As a result of this conflict, Italy captur ...
of 1911/12 as well as during the
Balkan Wars
The Balkan Wars were two conflicts that took place in the Balkans, Balkan states in 1912 and 1913. In the First Balkan War, the four Balkan states of Kingdom of Greece (Glücksburg), Greece, Kingdom of Serbia, Serbia, Kingdom of Montenegro, M ...
of 1912/13, Russia made attempts to obtain the opening of the straits for Russian warships but failed for want of support from the
Great powers.
In April/May 1912, the straits were closed for some weeks, and in response to subsequent threats of closure Russia indicated that it would take action in the event of a prolonged closure.
At the outbreak of war, the Ottoman Empire was diplomatically isolated; it had sought an alliance with Britain at the end of 1911, between May and July 1914 with France and Russia, and on 22 July with Germany, to no avail. Russia was concerned about the potential arrival in the Black Sea of two modern warships being built by British shipyards for the
Ottoman Navy, the , which had been completed and was making preparations to leave, and the . On 30 July,
Russian Minister of Foreign Affairs Sergey Sazonov instructed Benckendorff:
it is a matter of the highest importance for us that Turkey should not receive the two dreadnoughts..point out to the English government the immense importance of this matter for us, and energetically insist upon the retention of these two ships in England."
First Lord of the Admiralty Winston Churchill
Sir Winston Leonard Spencer Churchill (30 November 1874 – 24 January 1965) was a British statesman, military officer, and writer who was Prime Minister of the United Kingdom from 1940 to 1945 (Winston Churchill in the Second World War, ...
had by then already decided on requisition and when the Turkish ambassador protested on 1 August, he was informed that "in view of the serious situation abroad it was not possible to allow a battleship to leave these waters and pass into the hands of a foreign buyer".
The
pursuit of the two German warships ''Goeben'' and ''Breslau'' by the
Royal Navy
The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
led to their being allowed to enter the Dardanelles on 10 August 1914.
Details
Historian Dmitrii Likharev, analysing key contributions in the historiography of the subject points to contributions of C. Jay Smith who obtained access to the Asquith papers in the 1960s and to William Renzi in 1970 who made use of records released by the British National Archives to date Britain's promise of Constantinople to the Russians to November 1914 and its genesis to earlier in September, prior to the Ottoman entry into the war.
From 4 March to 10 April 1915, the
Triple Entente of Britain, France, and Russia secretly discussed how to divide up the lands of the Ottoman Empire. Britain was to control an even larger zone in Persia, while Russia would get the Ottoman capital, Constantinople. The Dardanelles were also promised to Russia. The language of the agreement described the following boundaries:
...the city of Constantinople
Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
, the western bank of the Bosphorus, of the Sea of Marmara
The Sea of Marmara, also known as the Sea of Marmora or the Marmara Sea, is a small inland sea entirely within the borders of Turkey. It links the Black Sea and the Aegean Sea via the Bosporus and Dardanelles straits, separating Turkey's E ...
and of the Dardanelles
The Dardanelles ( ; ; ), also known as the Strait of Gallipoli (after the Gallipoli peninsula) and in classical antiquity as the Hellespont ( ; ), is a narrow, natural strait and internationally significant waterway in northwestern Turkey th ...
, as well as southern Thrace
Thrace (, ; ; ; ) is a geographical and historical region in Southeast Europe roughly corresponding to the province of Thrace in the Roman Empire. Bounded by the Balkan Mountains to the north, the Aegean Sea to the south, and the Black Se ...
to the Enez- Midye line... and... that part of the Asiatic shore that lies between the Bosphorus, the Sakarya River and a point to be determined on the Gulf of Izmit, and the islands of the Sea of Marmara, the Imbros and Tenedos islands.
The British and the French sought to limit Russian claims, but were not able to do so, and also had to contend with the possibility that Russia might make a separate peace with the Central Powers. The agreement was one of a series of agreements regarding the partition of the Ottoman Empire by the Triple Entente and Italy following the war, including the
Treaty of London (1915), the
Sykes–Picot Agreement (1916) and the
Agreement of Saint-Jean-de-Maurienne (April to August 1917).
The British
Gallipoli Campaign (1915–16) was aimed at seizing the Dardanelles and Constantinople, but was defeated by the Ottomans, and the Allies did not gain control of the region until
occupying it in November 1918, after the end of the war. By that time, the Communist
Bolsheviks
The Bolsheviks, led by Vladimir Lenin, were a radical Faction (political), faction of the Marxist Russian Social Democratic Labour Party (RSDLP) which split with the Mensheviks at the 2nd Congress of the Russian Social Democratic Labour Party, ...
had seized power in Russia during the
October Revolution
The October Revolution, also known as the Great October Socialist Revolution (in Historiography in the Soviet Union, Soviet historiography), October coup, Bolshevik coup, or Bolshevik revolution, was the second of Russian Revolution, two r ...
of 1917 and had signed
a separate peace with the Central Powers in March 1918, dropping out of the war.
As the Allies therefore no longer considered Russia among their number, and, indeed, did not even recognize the legitimacy of the Bolshevik government, the agreement was never implemented.
See also
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Diplomatic history of World War I
*
Occupation of Istanbul
The occupation of Istanbul () or occupation of Constantinople (12 November 1918 – 4 October 1923), the capital of the Ottoman Empire, by United Kingdom, British, France, French, Italy, Italian, and Greece, Greek forces, took place in accordan ...
References
Footnotes
Citations
Bibliography
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Constantinople Agreement in
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{{authority control
1915 in the Ottoman Empire
Treaties concluded in 1915
1910s in Istanbul
World War I treaties
Treaties of the United Kingdom (1801–1922)
Treaties of the Russian Empire
Treaties of the French Third Republic
1915 in Europe
Ottoman Empire–Russian Empire relations