<p style='text-align: justify;'>The main text of the manuscript is a 12th-century copy of the <i>Antidotarium magnum</i>, a text produced at the Abbey of Montecassino in the 11th century by or through the direction of a monk of Tunisian heritage known to modern scholarship as Constantinus Africanus (d. before 1098/1099). The <i>Antidotarium magnum</i> was the first substantial medical work produced in western medieval Europe that presented medical recipes and ideas from Arabic sources alongside recipes deriving from Greek, Roman, and subsequent western European medical sources. The work has often been confused with a similar text, the <i>Antidotarium Nicholai</i> or <i>Antidotarium paruum</i>, which probably originates from the medical school at Salerno, and is based in part on the <i>Antidotarium magnum</i>. Indeed, M.R. James mistook the main text in this manuscript for the 'Antidotarium (Nicholai)' in his descriptive catalogue of 1907-08. The probable cause of the confusion of these two <i>antidotaria</i> is the fact that the first recipe in both antidotaria pertains to <i>Aurea alexandrina</i>. However, as Monica H. Green has observed, the <i>Antidotarium Nicholai</i> typically opens with a prefatory address by a 'Nicholaus', and the content of the <i>Aurea alexandrina</i> recipes differs between the two. For another example of a 12th-century copy of the <i>Antidotarium magnum</i>, see <a target='_blank' class='externalLink' href='https://cudl.lib.cam.ac.uk/view/MS-SJC-G-00004/1'>Cambridge, St John's College, MS G.4</a>. </p><p style='text-align: justify;'>Dr Sarah Gilbert<br /> Project Cataloguer for Curious Cures in Cambridge Libraries<br /> Cambridge University Library</p><p style='text-align: justify;'><b>Bibliography</b>:<br />M. H. Green, 'The <i>Antidotarium Magnum</i>: A Short Description' (2019), esp. n. 19</p>