Burmann Quarto 3, a ninth-century manuscript of the works of Prudentius, is well known to philologists and art historians, to the former (under the siglum E) as a major source for the text of the poems, to the latter for its illustrations of the Psychomachia. This article focuses on the glosses to Peristephanon. First, I describe the hands of the seven main glossators and attempt to identify those who, in addition to glossing, corrected and/or punctuated the poetic text. I then provide the editio princeps of the glosses, in which I arrange the glosses by hand. A comparison of these glosses with those in Paris, B.N. lat. 8086 (P) suggests that the first two glossators of E and the first glossator of P drew on a common source; indeed, the two manuscripts show so many similarities that it looks quite possible that they were written in the same scriptorium. From a comparison of the E and P glosses on Pe. to those found in other manuscripts of approximately the same period, I infer that E and P preserve material from a lost commentary on Pe. composed by Johannes Scotus Eriugena, which, a generation later, became the basis for the extant commentary by Remigius of Auxerre. I find support for this theory in the fact that, in their wording and content, the glosses of E and P on Contra Symmachum sometimes agree with those of John against the corresponding glosses of Remigius.