Thought this might be of interest. Apparently Charlemagne commissioned a puzzle book during his time to encourage math literacy. Two puzzles from this book are republished in a book “The Total Brain Workout” by U. of Toronto professor Marcel Danesi. They are described in the following article in the New York Times.
http://tierneylab.blogs.nytimes.com/2009/03/03/a-prize-for-solving-charlemagnes-puzzle/?scp=1&sq=puzzle&st=cse
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Danesi also wrote a book called "The Liar Paradox and the Towers of Hanoi: The 10 greatest math puzzles of all time." It's actually pretty interesting, and it relates all the puzzles back to a particular branch of mathematics. Definitely an interesting read.
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