Ruine Alt-Dettingen

The ruins of Alt-Dettingen stand on the south-west shore of the Überlinger See near the village of Dettingen, now part of Konstanz. Built late in the 12th century by the lords of Dettingen, the family included the Minnesänger Heinrich von Tettingen and Werner von Tettingen, a high officer of the Teutonic Order. By 1350 the castle had been abandoned and later passed to the Teutonic Order’s commandery on Mainau. Traces remain of the polygonal ring wall and the shell of the residential tower that once formed a twin complex with Neu-Dettingen. A short path with wooden steps leaves the courtyard, crosses the dry ditch and climbs to the mound where the ruins stand. A wooden sign leaning against the wall claims the castle was destroyed in the Thirty Years’ War, though no detailed evidence survives. The surviving masonry shows how the builders shaped the curtain wall into many-sided angles for strength. The tower’s crumbling shell still rises above the water’s edge, giving a clear sense of the original height. Visitors reach the site along a quiet lakeside lane and enter through the old gate passage. From the top of the mound the Überlinger See stretches northwards, its surface reflecting the hills of the Hegau. The ring wall fragments frame views of the distant Alps on clear days. The single remaining tower base offers a place to sit and look across the water to Mainau Island. The whole ruin occupies a small wooded promontory, quiet except for the sound of waves against the stones.