In 1792, the estate was purchased by Peter von Biron, Duke of Courland and Sagan. This educated man and lover of art and science had led a colorful life full of dramatic twists and turns. He grew up in the tsarist court, and in 1740, at the age of sixteen, he followed his father into long-term exile in Siberia. In 1769, he succeeded his father as ruler of the Duchy of Courland, where he reformed the backward education system, supported the arts and sciences, and strove for the economic prosperity of the country. The bleak domestic political situation and the interference of Poland and Russia in Courland affairs led the duke to abdicate in 1795. During his short reign, he significantly raised the level of cultural life on the Náchod estate. He established a theater right in the castle, where he organized opera performances, musicals, and plays. He demonstrated his progressive and enlightened reformist spirit by, among other things, following the example of chamber estates and converting labor duties on the local estate into wages. After the duke's death in 1800, the estate was inherited by his eldest daughter, Katharina Friederike Wilhelmine, known as the princess from Božena Němcová's novel The Grandmother. This Duchess of Sagan went down in history mainly for her active participation in the formation of the last anti-Napoleonic coalition in 1813.