The 14th century was marked as a period of impressive development and vast influence of Krzeszów Abbey. Its estates comprised about 40 villages and the towns of Lubawka and Chełmsko. Meanwhile, upon the death of Duke Bolko II the Small in 1368, the time of the Świdnica–Jawor Piast line's extinction started its decline. The duchy was inherited by the Bohemian Crown and during the Hussite invasions and again during the Thirty Years' War, the abbey was totally destroyed and plundered. However, after the 1648 Peace of Westphalia, a new prosperous period for the abbey began.