During the High Middle Ages , Legnica was one of the most important cities of Central Europe , having a population of nearly 16,000 inhabitants . The city began to rapidly develop after the sudden discovery of gold in the Kaczawa River between Legnica and the town of Złotoryja . In 1675 it was incorporated into Habsburg ruled Kingdom of Bohemia . In 1742 the city was annexed by the Kingdom of Prussia after King Frederick the Great 's victory over Austria in the War of the Austrian Succession . It remained , as a city with a German majority , a part of Germany until the end of World War II , when all Silesia east of the Neisse ( Nysa ) , was transferred to Poland following the Potsdam Conference in 1945 following demands by the Polish delegation that Poland be compensated for the loss of the Kresy
Potsdam Conference
Potsdam Conference
Legnica