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Report No. a503

Summa ‘Actor et reus’



Alternative Names



The title given by L. Wahrmund to a procedural treatise, written during the pontificate of Gregory IX (1227–1241). It enjoyed wide distribution and was originally combined from two earlier ordines, Quidam impetrauit litteras (‘Text A’) and Nos petimus (‘Text B’). Kuttner has associated these two with the Anglo-Norman school of canon law and dated them around 1200. Fowler–Magerl has supported the Anglo-Norman affiliation.



No. 1

Summa ‘Actor et reus’, c.1200.


Text(s) – Manuscripts

No. 1

Summa ‘Actor et reus’, c.1200.


Avignon, Bibl. du Musée Calvet 662, fols. 61ra–63rb (fragment)


Avignon, Bibl. du Musée Calvet 762, fols. 112r–119rb


Bamberg, Staatsbibl. Can. 92, fols. 101r–106vb


Berlin, Staatsbibl. Sav. 33, fols. 16va–31ra


Bologna, Coll. Spagna 219, fols. 99va–102rb (fragment)


Brugge, Stedelijke Bibl. 355, fols. 191r–194r (fragment)


Cambridge, Gonville & Caius Coll. 54/31, fols. 64rb–71ra


El Escorial, Bibl. San Lorenzo g.II.15, fols. 49r–51va


Freiburg im Breisgau, Universitätsbibl. 90, fols. 1r–22v


Kassel, Universitäts- u. Landesbibl. 4° Jurid. 29, fols. 67rb–73ra


Kaliningrad, Universitätsbibl. 40, fols. 66r–79v


Kaliningrad, Universitätsbibl. 42, fols. 103r–104r (fragment)


Kaliningrad, Universitätsbibl. 60, fols. 64r–68r (fragment)


London, BL Addit. 4907, fols. 43r–56v


London, BL Harley 3763, fols. 31va–39ra (transmits a part of Text B otherwise unpreserved; cf. article by Sayers)


London, BL Royal 11.B.XIV, fols. 122vb–128va (fragment)


Luxembourg, BN 228, fols. 44–59


Madrid, BN 243, fols. 1r–7va


Metz, BM 157, fols. 61vb–62ra (fragment)


Monte Cassino, Bibl. Abbazia 136, fols. 235a–241


Paris, BN lat. 4603, fols. 167r–174va


Paris, BN lat. 4604, fols. 81vb–84va


Sion, Arch. et Bibl. Cantonales S 102, 113v–117r


Soissons, BM 55, fols. 83–84


Stuttgart, Würtembergische Landesbibl. HB VI 94, fols. 9ra–18r


Stuttgart, Würtembergische Landesbibl. theol. et phil. fol. 148, fols. 139va–144r


Torino, BN Universitaria J VI 9, fols. 124v–126v (burned in 1904)


Città del Vaticano, BAV Ottob. lat. 16, fols. 80v–95v


Città del Vaticano, BAV Pal. lat. 666, fols. 167ra–174rb


Text(s) – Modern Editions

No. 1

Summa ‘Actor et reus’.

Modern Editions

Ed. L. Wahrmund in AKKR, 79 (1899) 403–24, 603–28.



L. Fowler-Magerl, Ordo iudiciorum vel ordo iudcarius (Frankfurt am Main 1984) 203–207, 210–14.

J. Sayers, ‘An Evesham Manuscript Containing the Treatise Known as “Actor et Reus”’, BMCL, 6 (1976) 75–81.

S. Kuttner, ‘Analecta iuridica Vaticana’, in Collectanea Vaticana in honorem Anselmi M. Card. Albareda (Studi e Testi 219; 1962) 1.415–52.

L. Wahrmund, ‘Actor et reus’, AKKR, 79 (1899) 403–24, 603–28.