Denis-Daniel de Froment
Boswell first met Froment, the husband of his travelling companion from Utrecht to Berlin, Emet-Ulla, in Berlin on July 5, 1764. He described him as "a lively Frenchman, pretty much mellowed.". Boswell and Froment stayed within a short distance of each other during Boswell's Berlin stay, and they often dined together.
The main source for the biography is The Journal of his German and Swiss Travels.