This volume is a database of information about and references to literature on commentaries on Greek and Latin medical writers. It includes Greek and Latin commentaries up to the 12th century on authors, who were active before 600 A.D. It takes account of commentaries on Galen in particular and of later Alexandrian physicians - surviving and lost - as well as of commentaries originally composed in Greek which were only transmitted in Arabic translation. This catalogue summarises current knowledge of these commentaries covering manuscripts, editions, type of commentary, and the state of research. Particulars of primary sources and detailed literature references enable users to fine-tune their searches in this corpus of material.