Wellenberg Castle, Castle in Felben-Wellhausen, Switzerland.

Wellenberg is a castle on a spur of the Wellenberg hill above the Thur valley in Felben-Wellhausen, near Frauenfeld. It was first documented in 1204 with Walter von Wellenberg. The Zürich forces destroyed and burned it in 1258 because raids were launched from it. It later became a Reichenau monastery fief held by the lords of Hohenlandenberg, who also ruled from Frauenfeld and Sonnenberg castles.

The earliest written record dates to the early 13th century, when the Wellenberg family used it as their seat of power. Since then it has changed hands and undergone modifications, but always remained a residential stronghold.

The name comes from the Wellenberg family, first documented in 1204. Margarethe von Hohenlandenberg founded the castle chaplaincy in 1450, from which the parish of Felben later developed. In 2004 the 800th anniversary was marked with the founding of the Schloss Wellenberg foundation.

Visiting requires advance planning since tours are available only by arrangement with the administration. Those wishing to explore the grounds should wear appropriate shoes and allow time for a walk through the park.

The castle was destroyed and burned by Zurich forces in 1258 because raids had been launched from it; Ulrich von Wellenberg and his two nephews were imprisoned in Zurich and had to swear an oath of non-violence. In 2004, the 800th anniversary of the castle was celebrated with the founding of the Schloss Wellenberg foundation.