The year before he had been appointed to the position of Kapellmeister to Duke Johann Friedrich of Brunswick-Lüneburg; just months after the duke had assumed authority over the Principality of Calenberg upon his elder brother Georg Wilhelm's inheriting of the Principality of Lüneburg.
In some districts the conversion of the monarchs, e.g. Duke John Frederick of Brunswick and Lunenburg, Prince of Calenberg (1651) and Duke Christian I Louis of Mecklenburg-Schwerin (1663), brought Catholics some measure of freedom.
On successfully completing his degree, in 1767 Dietrich became ordinary assessor (Beisitzer) to the Calenberger Hofgerichtes in Hanover, rapidly rising to Hofrat in 1770, full Kriegsrat in 1774, Hofrichter to the Calenberger Hofgericht in 1778 and to Landrat and Schatzrat to the Principality of Calenberg in 1782.
Today the term Calenberg Land is usually only used for the region between Hanover and the Deister.
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Elisabeth of Brunswick-Calenberg (8 April 1526 in Nienover – 19 August 1566 in Schleusingen) was a princess of Brunswick-Calenberg by birth and by marriage a Countess of Henneberg.