Personal data
Christoph Dietrich von Keller
Born 1699   Died 1766  

Originally an envoy from Würtemberg, he eventually joined the service of Gotha where he held various positions including that of Privy Counsellor (1751-), Director of Excise (1757-), Head of the Geheimen Ratskollegiums (1757-1760) and First Minister of Saxe-Gotha (until November 28, 1763).1

Boswell had a recommendation for the Baron, which he sent to him in Gotha on October 17, 1764. Keller, however, was not in the city at the time, and the two does not seem to ever actually meet.

Boswell on the Grand Tour I, 1764

Unless otherwise noted, the source for a dated quotation of Boswell's is generally the corresponding volume of the Yale Trade Editions of Boswell's journals.