Burg Frauenberg, Medieval castle ruins in Feuerbach, Stuttgart, Germany

Burg Frauenberg is a ruined hilltop castle in Stuttgart-Feuerbach. Its central tower once stood about 20 m high, and the surviving tower base, with walls 3 to 3.8 m thick, is the only visible remnant. The small interior space, used as a prison around 1390, can still be seen at the turning circle of An der Burg street.

Burg Frauenberg was built between 1220 and 1250, as mason's marks on the buckelquader stones indicate, and was first documented on 1 July 1251; the earliest known lord was Wolfram von Frauenberg. From the late 14th century seven families shared ownership, making it a Ganerbenburg. In 1481 Count Eberhard im Bart bought the remaining halves of the castle, Feuerbach and Botnang, bringing the whole lordship to Württemberg. The castle decayed and was quarried, mainly for Stuttgart's town wall, so that by the early 16th century no visible remains were left.

The red-and-silver shield of the Lords of Frauenberg served as Feuerbach's coat of arms until 1933. From the late 14th century the castle was a Ganerbenburg shared by seven families, among them the Helmstatt and the Schenken von Winterstetten. The tower keep held a small prison cell, visible today, where the knights Wilhelm and Peter von Helmstatt locked up Cologne merchants around 1390.

Only the tower's foundation walls remain, visible at the turning circle of the street An der Burg in Stuttgart-Feuerbach. The remains were uncovered in 1971 and secured in 1973, when a small enclosure was built around them. The spot lies on the hill above the Feuerbach valley, not on the valley road itself.

Around 1390, the tower served as a prison where two knights held merchants captive and demanded ransom payments. It took intervention by Count Eberhard II to stop this illegal activity.