The Roman law of sale with modern illustrations Digest xviii, 1 and xix, 1. This book, "The Roman law of sale", by Justinian I Emperor of the East, is a replication of a book originally published before 1907. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.