Gaggenau is a town in the district of Rastatt, in Baden-Württemberg, Germany. It is located some 8 km northeast of Baden-Baden. Gagge…Gaggenau is a town in the district of Rastatt, in Baden-Württemberg, Germany. It is located some 8 km northeast of Baden-Baden. Gaggenau was first mentioned in local records in 1243 under the name "Gaggenaw". The present district of Bad Rotenfels is even older, having been mentioned in a royal donation letter in 1041. Gaggenau remained a small village until the 19th century: Originally part of the Ufgau, it came under the jurisdiction of the marquisate of Baden in the 13th century, and was included in the territory claimed by the Margrave of Baden-Baden in 1535, which held it until 1689. At that time, it was placed under the jurisdiction of the Kuppenheim district of the Bishopric of Speyer. It was eventually assigned to the jurisdiction of the Rastatt Office of the State of Baden, which later became the District of Rastatt.