Digital edition by Claudia Bolgia. The text (probably written in the 13th century) was edited by E. Monaci,Archivio della Società Romana di Storia Patria, 38 (1915), pp. 562-587, and by R. Valentini and G. Zucchetti, Codice topografico della città di Roma, vol. 3, Rome 1946, pp. 116-136. The only extant manuscript of the text is preserved in Florence, Biblioteca Laurenziana, Ms. Gaddiano rel. 148.
Digital edition by Claudia Bolgia. Critical edition by R. B. C. Huygens: Magister Gregorius, Narracio de mirabilibus urbis Rome, Leiden 1970, revised on the codex unicus (Cambridge, St Catharine’s College, E.IV.96) by C. Nardella, Il fascino di Roma nel Medioevo. Le «Meraviglie di Roma» di maestro Gregorio, Rome 1997, 20072; English translation and commentary by J. Osborne: Magister Gregorius, The Marvels of Rome, Toronto 1987. The text was probably written between the end of the 12th and the first decades of the 13th centuries (possibly between 1226 and 1236).
Digital edition by Claudia Bolgia. Critical edition by L. Smith: P. P. Vergerio, Epistolario, Rome 1934, pp. 211-220; a more accurate text and commentary is edited by R. Valentini and G. Zucchetti, Codice topografico della città di Roma, vol. 4, Rome 1953, pp. 93-100. The epistle, addressed to an unspecified friend, was written in 1398.