The First Partition of Poland took place in 1772 as the first of three partitions that eventually ended the existence of the Polish–Lithuanian Commonwealth by 1795. The growth of power in the Russian Empire threatened the Kingdom of Prussia and the Habsburg monarchy and was the primary motive behind the First Partition.

Frederick the Great, King in Prussia, engineered the partition to prevent Austria, which was envious of Russian successes against the Ottoman Empire, from going to war. Territories in Poland–Lithuania were divided by its more powerful neighbours (Austria, Russia and Prussia) to restore the regional balance of power in Central Europe among those three countries.

With Poland unable to defend itself effectively and foreign troops already inside the country, the Polish Sejm ratified the partition in 1773 during the Partition Sejm, which was convened by the three powers.

First Partition of Poland
Robert Sayer · Public domain via Wikimedia Commons

Background

By the late 18th century, the Polish–Lithuanian Commonwealth had been reduced from the status of a European power to that of a country under major influence of, and almost becoming the protectorate (or vassal) of, the Russian Empire, with the Russian tsar effectively choosing Polish–Lithuanian monarchs during the free elections and deciding the outcome of much of Poland's internal politics. For example, the Repnin Sejm of 1767–68 was named after the Russian ambassador who had unofficially presided over its proceedings.

The First Partition occurred after the balance of power in Europe shifted, with Russian victories against the Ottomans in the Russo-Turkish War (1768–1774) strengthening Russia and endangering Habsburg interests in the region (particularly in Moldavia and Wallachia). Habsburg Austria then started considering waging war against Russia.