365 day meme - month 2, day 28

[dimity_blue]

28 If you could travel back to medieval times what single object would you take back with you that would guarantee that you would be made a king/Queen (or burned for witchcraft!)?

First, I wouldn't be willing to go. I love history but don't want to experience it first hand. If I had to go, I'd take a whole stack of books detailing the medicinal properties of every plant and the cures for every disease possible.