The term “letterlocking” refers to the process by which letters, in this case on paper, were folded and secured in order to prevent the information contained within falling into unintended hands. In use from the late Middle Ages, these techniques were commonplace among the nobility and those working for them, as well as the general public. Conservator Jennifer Jarvis will briefly discuss the history of these documents before demonstrating how to make your own locked letters, which make perfect secret Valentines! To learn more, visit jhu.edu/hopkinsathome