Wikipedia:But for Napoleon, it was Tuesday

Edward Jenner was an English physician and scientist who was the pioneer of smallpox vaccine, the world's first vaccine. He also lived during the Napoleonic Wars, and asked Napoleon to release some British prisoners of war. It is reported that Napoleon said "Ah, Jenner, je ne puis rien refuser a Jenner" (Ah, Jenner, I can refuse him nothing).[1] For Jenner, it was an important political achievement: it proves that his recognition was so high that even a world leader waging war against his country respected him. But for Napoleon, it was Tuesday.