Lucas Mason-Brown is the cryptographer who recently deciphered a handwritten code developed by Roger Williams. The margins of an obscure book in the John Carter Brown Library are virtually filled with clusters of curious foreign characters -- which turned out ot Williams's mysterious shorthand. Historians call the now-readable writings the most significant addition to Williams's scholarship in a generation or more. Williams is Rhode Island's founder and best known as a proponent for the separation of church and state, an idea that would later be enshrined in the Bill of Rights. An informal reception will follow the event.