All territories lost in both World Wars account for 33% of the former German Empire, while land ceded by Germany after World War II constituted roughly 25% of its pre-war Weimar territory.[2] In present-day Germany, the term usually refers only to the territories lost in World War II.[3] Territories acquired by Poland after World War II were called there the Recovered Territories.[4] These territories had been ruled as part of Poland by the Piast dynasty in or since the High Middle Ages, with the exception of Prussia which was inhabited by Old Prussians and came under Polish suzerainty in the Late Middle Ages, and had become predominantly German over the centuries.