Union of Lublin (1569): The Polish-Lithuanian Commonwealth Born

The Union of Lublin, signed on 1 July 1569, joined the Kingdom of Poland and the Grand Duchy of Lithuania into a single state, the Polish-Lithuanian Commonwealth. It created a shared, elected monarchy and a common parliament while leaving each nation its own laws, armies and treasury. For more than two centuries the Commonwealth was one of the largest states in Europe and a rare example of a country governed largely by its nobility.

Background: two countries, one dynasty

Poland and Lithuania had been linked since the Union of Krewo in 1385, when the pagan Grand Duke Jogaila of Lithuania married the Polish queen Jadwiga, accepted Christianity and became King Władysław II Jagiełło. For almost two centuries the two countries usually shared a ruler from the Jagiellonian dynasty, but they remained separate states.

By the 1560s this arrangement looked fragile. King Sigismund II Augustus, who ruled both lands, had no children, and when he died the personal link between Poland and Lithuania would end. Polish nobles had long wanted a closer, permanent union, while the great Lithuanian magnate families, especially the Radziwiłłs, feared losing their power.

The pressure of war

The decisive factor was war with Muscovy. In 1558 Ivan IV, known as Ivan the Terrible, invaded Livonia (roughly modern Latvia and Estonia), and Lithuania was drawn into the conflict. In 1563 Muscovite forces captured Polotsk, an important Lithuanian city. Lithuania could not pay for the war alone and needed Polish troops and money.

Meanwhile, the lesser Lithuanian nobility admired the rights of their Polish counterparts, who had a strong voice in the Sejm (parliament) and protection against royal and magnate power. Many of them favoured union, even as the magnates resisted. At an assembly in the Lithuanian army camp at Vitebsk in 1562, Lithuanian nobles had already petitioned for closer ties with Poland.

Polish opinion was shaped by the “execution movement”, a campaign of the middle nobility to enforce existing laws and recover crown lands from magnates. Its leaders saw a full union with Lithuania as part of their programme of reform, and Sigismund Augustus increasingly supported them.

The Sejm at Lublin

A joint Sejm opened in Lublin on 10 January 1569 to negotiate the terms. The Poles wanted a full merger; the Lithuanian lords wanted a looser alliance. On the night of 1 March 1569 the Lithuanian delegation, led by Mikołaj Radziwiłł the Red, left Lublin to block the talks.

Sigismund Augustus responded with force of law. Between March and June 1569 he transferred Podlachia, Volhynia, Bracław and the Kyiv region, large territories in what is now eastern Poland and Ukraine, from the Grand Duchy to the Polish Crown. Local nobles there were required to swear loyalty to the Crown. The Grand Duchy lost a large share of its land.

Facing the loss of even more territory, the Lithuanian delegates returned. After further bargaining, the act of union was signed on 1 July 1569 and confirmed by the king on 4 July.

The Lithuanians secured some concessions in the final weeks. They kept their own high offices, such as the grand hetman, chancellor and treasurer, and their own seal, and the name of the Grand Duchy remained in the royal title. Some Lithuanian lords later complained that they had signed under duress, a view echoed in parts of Lithuanian historiography.

Terms of the union

The Union of Lublin created a single “Commonwealth of Both Nations” (in Polish, Rzeczpospolita Obojga Narodów). Its main terms were:

• One monarch: The King of Poland would also be Grand Duke of Lithuania, chosen in a joint election and crowned in Kraków.
• One parliament: A common Sejm, which soon met in Warsaw, and a common Senate would make laws for both.
• One foreign policy: War, peace and alliances would be decided jointly.
• Shared currency in principle, and the right of nobles to own land anywhere in the Commonwealth.
• Separate institutions: Lithuania kept its own name, law, chancellery, treasury, army and officials.

Livonia was to be ruled jointly by both nations. The result was a federal state in which nobles of both countries enjoyed the same privileges. Royal Prussia, which had kept wide autonomy since 1466, was also brought more closely into the Crown at the same Sejm.

Consequences

Sigismund II Augustus died on 7 July 1572, and with him the male line of the Jagiellonians. The nobility then elected kings in free elections open to every nobleman. The first, Henry of Valois, had to accept the Henrician Articles in 1573, which limited royal power and confirmed the rights of the nobility. In the same year the Warsaw Confederation guaranteed religious peace among the nobility, at a time of religious wars elsewhere in Europe.

The Commonwealth grew powerful. Around 1582 it covered roughly 815,000 square kilometres, and in the early seventeenth century close to 1 million square kilometres, with a population that historians estimate at roughly 8 to 11 million. It fought Muscovy, Sweden and the Ottoman Empire, and in 1610 Polish troops even occupied Moscow.

The union also had lasting costs. Polish language and culture spread among the Lithuanian and Ruthenian nobility, while peasants were increasingly tied to the land as serfs. In the Ukrainian lands transferred to the Crown, tensions between Polish landlords, Orthodox peasants and Cossacks led in 1648 to the great Cossack uprising under Bohdan Khmelnytsky.

Legacy

The Commonwealth’s system of noble democracy, with its elected kings and powerful Sejm, was admired by some contemporaries but also proved hard to govern. In the eighteenth century, weakened by internal paralysis and foreign interference, it was divided by its neighbours in the Partitions of Poland of 1772, 1793 and 1795.

The union remains a central symbol in Polish and Lithuanian memory, though it is viewed differently in each. Poles have often seen it as a voluntary partnership of free peoples; Lithuanian historians have stressed the pressure under which it was signed. Jan Matejko’s large painting of 1869, made for the 300th anniversary, shaped the popular image of the event.

The idea of a shared commonwealth survived the partitions. The Constitution of 3 May 1791 was followed by the Reciprocal Guarantee of Two Nations, which reaffirmed the equal status of Poland and Lithuania. In the nineteenth century, Polish and Lithuanian insurgents rose together against Russian rule in 1830 and 1863, and in the twentieth century politicians such as Józef Piłsudski dreamed of reviving a federation in the region. Today historians often compare the union with later experiments in European cooperation, while noting that it was a union of nobles rather than of whole peoples.

Timeline

• 1385, 14 August: Union of Krewo links Poland and Lithuania under one ruler.
• 1563, February: Muscovite forces capture Polotsk.
• 1569, 10 January: The joint Sejm opens at Lublin.
• 1569, 1 March: Lithuanian delegates leave Lublin.
• 1569, March–June: Podlachia, Volhynia, Bracław and Kyiv are transferred to the Polish Crown.
• 1569, 1 July: The act of union is signed.
• 1572, 7 July: Death of Sigismund II Augustus, the last Jagiellonian king.
• 1795, 24 October: Third Partition ends the Commonwealth.

Why it matters

The Union of Lublin created a major European power that lasted more than 225 years and shaped the history of modern Poland, Lithuania, Belarus and Ukraine. Its blend of shared government and local autonomy is still studied as an early experiment in federal union.