They first received recognition by the Frankish ruler Charlemagne, and were granted a coat of arms. This honor was in respect of the unwillingness to surrender of a member of the family (since being considered the first lord) during the Frankish ruler's wars eastward through what is now Germany, notably against the Saxons. Although the Rau family became a well-landed family in Hesse, with their seat at Rauischholzhausen, other estates such as the baronies of Nordeck and Frauenberg, and lands in Bavaria became properties to the noble Lords.
They initially gained recognition from the Frankish ruler Charlemagne, and were awarded a coat of arms. This honor was due to the refusal to surrender by a member of their family (considered the first lord) during Charlemagne's eastward campaigns through modern-day Germany, particularly against the Saxons. Although the Rau family became an affluent family in Hesse with their seat at Rauischholzhausen, other estates like the baronies of Nordeck and Frauenberg, and lands in Bavaria were acquired by noble lords.