In the preface to his 1911 edition of De uiris illustribus, Franz Pichlmayr listed, as the second of the manuscripts he had not examined, the codex Vatican City, Biblioteca Apostolica Vaticana, Barb. Lat. 812, in which the work was attributed to Aurelius Victor.Footnote 1 As Sage later pointed out, this was the only manuscript known to assign the text to that author.Footnote 2 It is well established that the erroneous ascription to Pliny the Elder is common to the manuscripts of Pichlmayr’s Class C. Such an attribution to Victor would therefore represent a rare exception, especially considering that the first ascription of De uiris illustribus to him that is otherwise known dates only to the edition of Andreas Schottus in 1577.Footnote 3
Sage, however, also urged caution regarding Pichlmayr’s accuracy, noting that another unexamined manuscript of the same list (no. 16, Claromontanus), allegedly attributing the work to Aemilius Probus, was in fact a manuscript of Cornelius Nepos.Footnote 4
During a research visit to the Biblioteca Apostolica Vaticana in January 2025, I was able to verify that codex Barb. Lat. 812 does not in fact contain De uiris illustribus but rather a collection of records from the Council of Trent. This paper codex, written in a single sixteenth-century hand, includes the following: fols. 1–156 Diarium Concilii Tridentini sub Pio Quarto per Ioannem Astulfum Servatium Septempedanum Picenum (so identified in the index on fol. 1v), beginning on 2 October 1560 and ending on 10 December 1563; fols. 157–78, papal bulls and official documents dating from 1561 to 1563.
I also investigated whether modifying or inverting the shelfmark digits might resolve the confusion, but these attempts were without avail. For instance, Barb. Lat. 821 contains a Diarium Angeli Massarelli de Severino post et ante discessum ex Urbe ad Concilium Tridenti celebrandum die 23. Februarii 1545 usque ad diem primam Februarii anni 1546, while Barb. Lat. 128 has materials from Seneca’s Epistulae ad Lucilium and Tragoediae. I also explored other collections: for example, Vat. Lat. 812 (fols. 1r–447r) includes Guibertus Tornacensis, O.F.M., m. 1284, Sermones dominicales; Ott. Lat. 812 contains Guillame Peiraut, Tractatus spiritualis de virtutibus et vitiis. None of these proved helpful.
As a result, and in the absence of additional information, it is impossible to determine the source of Pichlmayr’s information. Thus, hopes fade of identifying the only manuscript said to attribute De uiris illustribus to Aurelius Victor.