Olsztyn District

Olsztyn District was a district within the Duchy of Wieluń. Its capital was Olsztyn. It was formed around 1378 from Wieluń Land and existed until 1391 when duchy was conquered by Kingdom of Poland. The city serves as a trade centre, with major rail and road connections, for the lake district. The Museum of Warmia and Mazury and a university are located in Olsztyn.