From about 800 jobs suddenly only 10 remained. Workers had to reorient themselves and take on new unfamiliar jobs. This changed Dielheim in the 1950s and 1960a to a commuter town. Only the creation of Dielheim's industrial and commercial district led to the creation of its own companies, so that workers could once again find jobs in town. Today's Dielheim is known as a wine-growing region with 77 hectares of surrounding grape fields. "Dielheimer Teufelskopf" is known by wine lovers throughout Germany. In 1972 Horrenberg joined the municipality of Dielheim. Horrenberg lies on a road between Speyer, Bad Wimpfen, and Nuremberg that has been in use since Roman times. This road, named an imperial highway ("Reichstrasse") in 1433, was one of the most important thoroughfares in Germany up until the late Middle Ages. In medieval documents, the road is often referred to as the "Kaiserstraße", the emperor's highway, because over the centuries many high ranking personalities used the imperial highway. The Roman general Julian (359), the king of the Huns Attila (451), king Conrad III (1150), king Philipp of Swabia (1199), emperor Frederick II (1205), and king Henry VII (1224) all sojourned past the place where Horrenberg stands today. A valuable glass fragment from the 11th or 12th century found at castle Horrenberg indicates the passing of royal parties. This kind of purple-red and white glass has otherwise only been found at St. Denis in Paris, in Italian Pavia, and in Birka near Stockholm. Around the year 1220, the then reigning lord of the region erected a fortified tower in order to protect the imperial highway at the toll station in Horrenberg. For the location of the fort, they chose a hill next to the highway which loomed a swampy low-lying section of the Leimbach. "Horrenberg" comes from HOR- swamp or mud and BERG mountain or hill. Around the castle a small village developed over time. The first noble recorded in association with Horrenberg is Dieter von Horrenberg in 1238. He was most likely named after the new castle. Before 1272, bishop Henry of Speyer took over the upper Bruhrain to which the village Horrenberg and castle belonged. This purchase related document is the first definitive mention of Horrenberg.