The edition of the Persius scholia of the „tradition B“ is the third and last volume (vol. I: tradition A, D, E, 2009; vol. II: tradition C, 2018 – the same publishers) of all medieval Persius scholia (from 9th – 16th century 75 testimonies) – hitherto only the texts of a few mostly misunderstood manuscirpts of Persius scholia were published. Now for the first time a complete series of medieval school commentaries of an ancient author is get-at-able. This scholia edition will be the basis and starting point of many research problems: As a few medieval Persius scholia show that they had known ancient Persius scholia, there is not only the general question of ancient sources, their origin and working up in medieval scholia, but also the necessary attempt of a reconstruction of the ancient Persius commentaries. And as the school commentaries were the basis of the about 35 mostly unopened Persius commentaries of medieval scholars, it is now possible to judge on the performances and results of these scholars. Furtheron the Persius scholia supply also important informations on all the questions of medieval school knowledge and learning, its material, methods and quality. So the scholia will answer to many questions of research to Antiquity and Middle Ages.