Saxe-Lauenburg was also known simply as Lauenburg. While the territory of Saxe-Wittenberg changed drastically over the centuries, the Duchy of Lauenburg remained almost unchanged, until it lost its independence in 1689, when it was inherited by the Principality of Lüneburg. From 1815–1864 it was ruled in personal union by the Duke of Holstein, being simultaneously King of Denmark. In 1864 it fell to Prussia after the Second Schleswig War. For a short period Lauenburg was still an autonomous entity, but in 1876 it was incorporated as a district into the Prussian province of Schleswig-Holstein.