Curzon Line
The Curzon Line is a border that was drawn on a map before it was ever drawn on the ground. Lord Curzon, the British Foreign Secretary, first proposed it in 1919 as a diplomatic basis for settling a disputed frontier between two nations that barely existed yet. Neither Poland nor the Soviet Union accepted it at the time. Yet within a generation, that same line would shape the fates of millions of people across an entire continent.
Why did a proposal that both sides ignored in 1919 become the permanent border of Poland by 1945? What did the territories it divided actually look like, and who lived there? And how did a line drawn in London end up being defended by Stalin himself at one of history's most consequential diplomatic tables?
Herbert James Paton first suggested the idea that Lord Curzon would make famous. When the Supreme War Council in 1919 tasked the Commission on Polish Affairs with recommending Poland's eastern border, the instruction was to follow spoken language majority. Their result was created on the 8th of December, 1919.
The line broadly separated territories where Polish was the dominant language from areas where Ukrainian, Belarusian, and Lithuanian speakers formed the majority. Its northern half traced a boundary that had already existed once before: the border the Kingdom of Prussia and the Russian Empire had recognised in 1797 after the Third Partition of Poland. In the south, the Commission produced two versions. Line A placed the city of Lwów, with its nearby oil fields, inside Russia. Line B placed it in Poland.
The Supreme Council published the line along with a careful hedge. It recognised Poland's right to administer territory west of the line but was careful to state it was not prejudging Poland's future eastern frontiers. Rights to territories east of the line were explicitly reserved. That diplomatic ambiguity would haunt negotiations for the next three decades.
Polish forces took Kiev in May 1920 during the Polish-Soviet War, pushing deep into territory the Curzon Line would have left to Soviet Russia. When a strong Soviet counteroffensive reversed those gains, Prime Minister Wladyslaw Grabski went to the Allies for help. Under pressure, he agreed to withdraw to the 1919 version of the line. It was at that moment, on the day Curzon signed a telegram to the Bolshevik government proposing a ceasefire along the line, that his name became permanently attached to it.
Georgy Chicherin, representing the Soviet side, rejected the proposal on the 17th of July. He pointedly noted the delayed British interest in a peace settlement. The Soviet government at that moment was actually offering Poland more favourable border terms than the Curzon Line itself provided. Then in August, the Soviets were defeated by the Poles just outside Warsaw and forced back.
The March 1921 Treaty of Riga reflected that reversal of fortunes completely. The Soviets conceded a frontier well to the east of the Curzon Line, giving Poland almost 135,000 square kilometres of land that was, on average, about 250 kilometres east of where the line ran. The League of Nations recognised this Polish-Soviet border in 1923.
Roman Dmowski and Jozef Pilsudski represented fundamentally opposed ideas about what Poland should be and where its future lay. Dmowski, a figure in the pan-Slavic movement and author of influential political books, argued for incorporating territory based on an ethnographic principle. He believed Belarusians could be assimilated into a centralised Polish state and approached the east pragmatically, seeing Germany as the more dangerous long-term enemy.
Pilsudski was born in the Vilna Governorate, the region annexed by the Russian Empire during the 1795 Third Partition of Poland. His political vision reached back further: a restoration of the borders of the Polish-Lithuanian Commonwealth in the form of a multinational federation. Because the Russian Empire had collapsed into civil war and the Soviet Army had been weakened by Germany before the end of World War I, Pilsudski saw a window of opportunity and moved to seize it through force.
This internal tension shaped the Treaty of Riga negotiations in ways that cut against Polish interests. The Polish delegation, where Dmowski's party held the strongest position, unilaterally ceded claims to the Minsk area. The goal, according to the source, was to undermine Pilsudski's ambition for a Polish-Belarusian federation with Minsk as its capital. It was calculated that a Belarusian entity without Minsk would be politically untenable. The tension between these two visions of Polish identity would leave a long shadow over how Poland's eastern territories were eventually settled.
According to historian Yohanan Cohen, in 1939 the population in the territories of interwar Poland east of the Curzon Line totalled 12 million people. That figure broke down as over 5 million Ukrainians, between 3.5 and 4 million Poles, 1.5 million Belarusians, and 1.3 million Jews. Ukrainians and Belarusians together composed the majority of the population across the region as a whole.
Polish speakers and Roman Catholics tended to dominate the main cities and some rural areas, particularly in the Vilnius region and Wilno Voivodeship. The 1931 Polish census data captured this in detail: Lwów's population of 312,231 showed a city with complex ethnic layering, and Wilno, with 195,071 residents, had a similarly mixed character. Smaller cities like Grodno, with 49,700 inhabitants, and Brzesc nad Bugiem, with 48,385, filled out a network of urban centres scattered across the contested terrain.
A 1944 article in The Times estimated that in 1931 between 2.2 and 2.5 million Poles lived east of the Curzon Line. Winston Churchill estimated the figure at 3 to 4 million during wartime negotiations. Stanislaw Mikolajczyk, then Prime Minister of the Polish government-in-exile, put it at 5 million. The variation in those estimates reflects how politically charged the count had become by the time the Allied leaders sat down to decide what to do about it.
The Molotov-Ribbentrop Pact of August 1939 initially drew the partition of Poland not along the Curzon Line but far beyond it, reaching territories near Lublin and Warsaw. After the military defeat of Poland in September, the Soviet Union annexed all territories east of the Curzon Line, plus Bialystok and Eastern Galicia. These lands were absorbed into the Byelorussian SSR and Ukrainian SSR following what the source describes as falsified referendums. Hundreds of thousands of Poles and a lesser number of Jews were deported eastward into the Soviet Union.
Operation Barbarossa, Germany's attack on the Soviet Union in July 1941, transferred control of those same territories to Nazi Germany. During the German occupation, most of the Jewish population in the region was deported or killed. Ukrainian nationalist partisans continued their own violent campaign, including the ethnic cleansing of the Polish population in Volhynia and East Galicia.
By 1944, Soviet forces had recaptured eastern Poland from the Germans. The Soviets unilaterally declared a new frontier running approximately along the Curzon Line. The Polish government-in-exile in London rejected this and insisted on the pre-war Riga Line. The altered Curzon Line was formally recognised by the western Allies in July 1945, and the border was adjusted several times afterward, with the largest revision coming in 1951.
Churchill's position on Poland's eastern border shifted after the Soviet victory at the Battle of Kursk. At the Tehran Conference, a private agreement took shape that the Curzon Line, with some variations of five to eight kilometres, would serve as Poland's future eastern border. That agreement was confirmed at the Yalta Conference in 1945, where Franklin Roosevelt, Winston Churchill, and Stalin signed a joint statement affirming the arrangement.
Churchill had pushed to include the city of Lviv on Poland's side of the line, following Line B. Stalin's response was pointed: he asked whether Roosevelt and Churchill wanted him to tell the Russian people that he was demanding less territory for the Soviet Union than the British government itself had previously reconfirmed, several times, as the appropriate line. The argument held. Lviv remained on the Soviet side.
The compensation offered to Poland for the territories lost in the east came in the form of formerly German lands to the west, the so-called Recovered Territories. This trade of eastern lands for western ones reshaped Poland's entire geographic position, shifting the country bodily westward. When the Soviet Union dissolved in 1991, the Curzon Line became Poland's border with three newly independent states: Lithuania, Belarus, and Ukraine.
Despite the expulsion of most ethnic Poles from Soviet territory between 1944 and 1958, the Soviet census of 1959 still counted around 1.4 million ethnic Poles remaining in the USSR. The largest concentration, 538,881 people, lived in the Byelorussian SSR. Another 363,297 were counted in the Ukrainian SSR, and 230,107 in the Lithuanian SSR.
More recent census figures show the long-term persistence of that community: around 295,000 Poles lived in Belarus in 2009, making up 3.1 percent of the country's population. The cities of Vilnius and Grodno still carry significant Polish populations today. Vilnius District Municipality and the Sapotskin region have Polish majorities. According to the source, about 3 million Roman Catholic Poles lived east of the Curzon Line within interwar Poland's borders. Of those, roughly 2.1 to 2.2 million died, fled, emigrated, or were expelled to the newly annexed German territories after 1945.
The Ukrainian nationalist fighters who survived the war did not simply disperse. They continued their partisan campaign and were eventually captured by the Soviets, sent to the Gulag, and actively participated in several uprisings there, including the Kengir uprising, the Norilsk uprising, and the Vorkuta uprising. The communities scattered by the Curzon Line carried their disputes into the prison camps of the Soviet system itself.
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Common questions
What is the Curzon Line and why was it created?
The Curzon Line was a proposed demarcation between the Second Polish Republic and the Soviet Union, first put forward in 1919 by Lord Curzon, the British Foreign Secretary, to the Supreme War Council. It was drawn by the Commission on Polish Affairs based on spoken language majority, broadly separating Polish-majority territories to the west from areas where Ukrainians, Belarusians, and Lithuanians predominated to the east. Its result was created on the 8th of December, 1919.
Did Poland accept the Curzon Line after World War I?
Poland did not accept the Curzon Line after World War I. The March 1921 Treaty of Riga instead gave Poland almost 135,000 square kilometres of land that was, on average, about 250 kilometres east of the Curzon Line. The Soviet Union conceded this frontier after the Poles defeated the Soviet Army outside Warsaw in August 1920.
How did the Curzon Line become Poland's permanent eastern border after World War II?
At the Tehran Conference and confirmed at the 1945 Yalta Conference, Franklin Roosevelt, Winston Churchill, and Stalin agreed to use the Curzon Line, with variations of five to eight kilometres, as Poland's eastern border. The western Allies formally recognised it in July 1945. Stalin argued that he could not demand less territory for the Soviet Union than the British government itself had reconfirmed the Curzon Line represented.
How many people lived east of the Curzon Line before World War II?
According to historian Yohanan Cohen, in 1939 the population of the territories of interwar Poland east of the Curzon Line totalled 12 million people. That population included over 5 million Ukrainians, between 3.5 and 4 million Poles, 1.5 million Belarusians, and 1.3 million Jews.
What happened to Poles living east of the Curzon Line after 1945?
About 3 million Roman Catholic Poles lived east of the Curzon Line within interwar Poland's borders. Of those, roughly 2.1 to 2.2 million died, fled, emigrated, or were expelled to newly annexed German territories after 1945. The Soviet census of 1959 still counted around 1.4 million ethnic Poles remaining in the USSR, with the largest group of 538,881 in the Byelorussian SSR.
What were Line A and Line B of the Curzon Line?
Line A and Line B were two versions of the southern portion of the Curzon Line, differing in how they handled Eastern Galicia. Line A placed the city of Lwów and its nearby oil fields within Soviet Russia. Line B allocated Lwów to Poland. When Churchill proposed at Yalta that Lwów be given to Poland under Line B, Stalin refused, and the line that became the permanent border kept Lwów on the Soviet side.
All sources
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