Paderborn is a city in eastern North Rhine-Westphalia, Germany, capital of the Paderborn district. The name of the city derives from the river Pader and Born, an old German term for the source of a river. The river Pader originates in more than 200 springs near Paderborn Cathedral, where St. Liborius is buried. Paderborn ranks 55th on the List of cities in Germany by population.