It says consecration on the box, but I think the ritual depicted is usually known as a coronation. In the image, Napoleon is just about to place a crown on the head of his wife, Josephine. Behind him is the pope Pius VII. The coronation took place in 1804, but the painting by Napoleon’s favourite artist, Jacques-Louis David, is from a few years later. More on the painting.

As a puzzle, this was nice, and easier than many other historical paintings that I’ve done. I did this for the monthly puzzle challenge in a FB group I’m in, which for March was “A Historical Event”.