What German doctor was also friends with Schack Carl Rantzau?
Schack Carl Rantzau: Schack Carl, "rigsgreve" (von) Rantzau or Carl Schack Rantzau-Ascheberg (11 March 1717, Ascheberg estate, Holstein – 21 January 1789, Menerbes, France) was a Holstein-born Danish officer and statesman.
i don't know