The place had its first documentary mention as "Heisinisheim" or "Hasinisheim" in donations to the Lorsch Abbey, the earliest of which purports to date from 762, although in actuality it can only be traced back to some time between September in one of the years between 765 and 768. The earliest confirmed date is 5 July 768. All together, the Lorsch codex catalogues ten endowments for the Lorsch Abbey in Heidesheim between 765 or 768 and 794, of which however none crops up in later documents. This circumstance leads to the inference that Lorsch had already traded or sold its holdings in Heidesheim by the time the Codex was transferred to parchment between 1183 and 1195.