Nancy Mitford published this in 1970. It was her last book, before she was so cruelly taken by cancer.
Nancy wrote four biographies. This one is about the Prussian King, Frederick the Great. It's a big book, with gorgeous plate photographs.
The book describes in elegant and witty details the confusing (to this reader anyway) polititcal shenanigans of 18th century Europe.
I enjoyed reading it, but didn't fully absorb enough of the detail to write a proper review.