The House of Nellenburg was a noble family in the region of Switzerland. It is known for its historical significance during the Middle Ages, particularly in the Canton of Thurgau. The family played a role in local governance and land ownership, contributing to the development of the area. The Nellenburg family is often associated with the Nellenburg Castle, which served as their residence. This castle, built in the 13th century, is a notable example of medieval architecture. Today, the remnants of the castle attract visitors interested in history and architecture.