Dielheim was first mentioned in the Lorsch codex in 767. Next to Diedelsheim and Schluchtern, Dielheim is one of the three oldest communities in the Kraichgau. The area was settled by the Romans, so one can assume the village was founded in the 6th century. The name used in the Lorsch Codex, "diuuelenheim", may be the result of a reading or writing error made in the 12th century. The letters "u" and "v" were often confused, so one can assume the name was "divvelenheim". The geminate "vv" stands for "w", which was not commonly used at that time. Therefore, we theorize that the name has an origin in the name of a Frankish founder named "Diwelo". After going through many changes, the spelling we see today, "Dielheim", first appears in the 17th century. The rulers of town can first be identified after late in the 13th century.