Lublin is the ninth-largest city in Poland and the second-largest city of historical Lesser Poland. It is the capital and the centre of Lublin Voivodeship with a population of 336,339. Lublin is the largest Polish city east of the Vistula River, located 153 km southeast of Warsaw. One of the events that greatly contributed to the city's development was the Polish-Lithuanian Union of Krewo in 1385.