Notable for the circumstances, from the book The Universal Computer by Martin Davis:

A biography of Leibniz "was completed by Professor Kurt Huber in prison while awaiting execution by the Nazis. He had supported the efforts of his students at the University of Munich who had formed the "White Rose" underground group and who were decapitated for distributing anti-Nazi leaflets."

Huber, K. Leibniz. Munich: Verlag von R. Oldenbourg, 1951.