In the mid-15th century, the powerful Bishop of Kraków, Cardinal Zbigniew Oleśnicki, purchased the small Duchy of Siewierz, which lay on the borderland between Lesser Poland and Silesia. As a result, successive Bishops of Kraków, right up until after the Second World War, could boast the title of duke.Today, the best way to discover this fascinating history is to stroll with an audio guide through the picturesque ruins of the castle in Siewierz, the former ducal capital. The audio guide lets you imagine what the fortress looked like in its heyday, and it also tells of little-known facts from the history of the bishops' tiny state and its rulers.After visiting the castle, we also encourage you to explore the centre of Siewierz together with the audio guide – a town which, although it lies on the busy "Gierkówka" road, still does not attract as many tourists as it should.