Schloss Achberg stands in the municipality of Achberg, Germany, on the site originally occupied by a medieval fortress belonging to the local lordship and settlement of the same name. This initial castle appears in written records dating back to 1335, though details about its early structure remain scarce.
During the 1500s, the medieval fortress underwent significant rebuilding, reflecting changes in architectural tastes and defensive needs. In 1691, Franz Benedikt von Baden, the Landkomtur (regional commander) of the Teutonic Order, acquired the Achberg lordship and castle. Soon after, between 1693 and 1700, the castle was transformed extensively into the Baroque style. This period of reconstruction included the creation of a lavishly decorated stucco ceiling in the main ceremonial hall, recognized as one of the most ornate examples of its kind in southern Germany.
Following its Baroque renovation, the castle served only intermittently as a residence for the Teutonic Knights, remaining largely unoccupied for extended periods. The secularization process in the early 19th century dissolved the Teutonic Order’s holdings, and in 1806, the castle and estate were absorbed by the Principality of Hohenzollern-Sigmaringen. Later, in 1850, this territory was incorporated into Prussia, rendering Achberg the southernmost area under Prussian authority.
