This work presents the first critical edition of a hitherto unknown commentary on Seneca's 'Hercules furens'. The author was Giovanni Segarelli, a lawyer and early humanist previously known to local historians only. Hafemann reconstructs his biography and work from scattered manuscript sources. Against the background of 14th century traditions of commentary, she undertakes an analysis of the author's exegetic interests, his understanding of tragedy, his method of paraphrastic exegesis, his sources and textual basis, together with his language, style and clausula technique.