The szlachta (Polish: AUDPl-szlachta.ogg'szlachta endonym, Lithuanian: šlėkta) were the noble estate of the realm in the Kingdom of Poland, the Grand Duchy of Lithuania, and the Polish–Lithuanian Commonwealth who, as a class, had the dominating position in the state, exercising extensive political rights and power. Szlachta as a class differed significantly from the feudal nobility of Western Europe. The estate was officially abolished in 1921 by the March Constitution.
The origins of the szlachta are obscure and the subject of several theories. Traditionally, its members owned land (allods), often folwarks. The szlachta secured substantial and increasing political power and rights throughout its history, beginning with the reign of King Casimir III the Great between 1333 and 1370 in the Kingdom of Poland until the decline and end of the Polish–Lithuanian Commonwealth in the late 18th century. Apart from providing officers for the army, its chief civic obligations included electing the monarch and filling honorary and advisory roles at court that would later evolve into the upper legislative chamber, the Senate. The szlachta electorate also took part in the government of the Commonwealth via the lower legislative chamber of the Sejm (bicameral national parliament), composed of representatives elected at local sejmiks (local szlachta assemblies). Sejmiks performed various governmental functions at local levels, such as appointing officials and overseeing judicial and financial governance, including tax-raising. The szlachta assumed various governing positions, including voivode, marshal of voivodeship, castellan, and starosta.
In 1413, following a series of tentative personal unions between the Grand Duchy of Lithuania and the Crown of the Kingdom of Poland, the existing Lithuanian-Ruthenian nobility formally joined the szlachta. As the Polish–Lithuanian Commonwealth (1569–1795) evolved and expanded territorially after the Union of Lublin, its membership grew to include the leaders of Ducal Prussia and Livonia.