MS Vatican City, Biblioteca Apostolica Vaticana, Reg. lat. 3259 (v) seems to have been designed with authority (auctoritas) in mind. It is a handsome northern French mid twelfth-century manuscript of the complete works of Horace and the Satires of Persius, which in the sixteenth century formed part of the impressive personal library of the Roman antiquarian Fulvio Orsini. It is a much higher-grade product than the other manuscripts I discuss in this book; the main text is written in a good book hand (hand i) which also writes marginal glosses which are ruled for – they are part of the book's original intention. There are two further layers of marginal glossing, not ruled for, and squeezed in and around the original marginal commentary. The second is in an Italian hand of the fourteenth century, and falls outside the scope of this study, but the first is in a later twelfth-century glossing hand (hand 2) and consists of a series of very heavily abbreviated glosses, including extracts from the text which are underlined. These features suggest that hand 2 copied the glosses from continuous or catena commentary on Horace in order to adapt v for pedagogic use. This suggestion is strengthened by the many linking syntactic glosses in hand 2, glosses whose abundance and consistency represent a sustained analysis which used the authoritative text as the basis for an examination of Latin syntax.