The codex comprises three distinct, though related, works, each apparently the opus of a different author. However, the author of the first piece and his purported son, the author of the second work, have recently been shown to be the same person: Joseph Solomon Delmedigo (1591-1655). He studied in Padua where one of his teachers was Galileo Galilei. By contrast, the named author of the third work, Ber Jeiteless, proves to be an actual person: Rabbi Issachar Ber Jeiteless (d.1685). Typical of central European Ashkenazi manuscripts of the middle and late seventeenth century, MS 199 is an important document commenting on specific legal matters, possibly containing two of Delmedigo’s last and hitherto lost works.For detailed descriptions, please see www.chch.ox.ac.uk/library-and-archives/digital-library.