[The book about equery, by Jordanus Ruffus (13th century), in Ms 78 C of the copper engraving collection, Berlin]

One of the italian translations of the "Medicina equorum" written by the major stablemaster of the Emperor Frederic II. of Hohenstaufen, JORDANUS RUFFUS, dates to the late 13th century. It forms part of a manuscript kept in the State Library of Berlin-West. It is the only copy of the "Medicina equorum" which depicts the treatments of the different horse diseases in a very instructive manner. A translation into German of this italian manuscript was carried out recently in our Institute. This paper emphasizes the historical value of this opus and makes comments on the illustrations.