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Bio-Bibliographical Guide to Medieval and Early Modern Jurists

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Report No. c025

Jacobus de Ardizone

1st half of 13th c.


Alternative Names

Jacobus de Ardizone de Broilo; Jacobus Veronensis; Iacopo di Ardizzone



Jurist from the city of Verona; son of a certain Ardizo, who provided Jacobus with his chosen siglum, ‘Ar’. He appeared in Bologna as early as c.1220 but perhaps later, c.1225–26, possibly in connection with the driving out of the Guelf party from Verona in that year. He then studied under Azo and Hugolinus. Later taught in Bologna and concentrated his own writings on feudal law, about which he was very knowledgeable. Compiled the definitive collection of extravagantes to the Libri feudorum and wrote an influential Summa feudorum, completed c.1240. He is then attested to in Veronese documents in 1242 (as causidicus) and 1244 (as iudex and consiliarius), but all traces of him disappear thereafter.



No. 01

Ardizonian Recension of the Libri feudorum. 2nd recension of the Libri feudorum including J. Ard.’s additions at 2.25–51.

No. 02

Revision of the Ardizonian Recension of the Libri Feudorum. Existence not known in manuscripts but indicated in the exegesis of this version in a Viennese manuscript; that text goes under the name of Compilatio feudorum secundum Ardizonem, or Liber Ardizonis. Seckel argued, and Lange has accepted, that the work provides strong evidence that J. Ard. re-worked and expanded his earlier version of the Libri Feudorum. Seckel also attempted to reconstruct this version.

No. 03

Summa feudorum, 1227–40. Worked on over a period of years. Divided into two books of seven titles each.

No. 04

Collectio Extravagantium, post 1234. Compilation of 179 extravagantes to the Libri feudorum, divided into seven titles. The majority of laws come from Lombard law, laws of the German emperors or kings, papal decretals, and also statutes from his hometown of Verona (which are not present in the Viennese manuscript but are known from citations in his Summa feudorum). Only a small portion of this collection made its way into J. Ard.’s version of the Libri feudorum.

No. 05

Summa de decurionibus, post 1233. On Cod. 10.32(31), having to do with high-ranking legal advisers and their sons. Edited together with Azo’s Summa Codicis.

No. 06

Summa quando et quibus debetur quarta pars. On Cod. 10.35(34); now lost.


Text(s) – Manuscripts

No. 04

Collectio Extravagantium, post 1234.


Wien, ÖNB 2094 (Not complete; edited by Seckel)


Text(s) – Modern Editions

No. 03

Summa feudorum.

Modern Editions

Iacobi de Ardizone Summa Feudorum (Corpus glossatorum juris civilis 5; Torino 1970).

No. 04

Collectio Extravagantium.

Modern Editions

Ed. E. Seckel in ‘Quellenfunde zum lombardischen Lehnrecht’, Festgabe der Berliner Juristischen Fakultät für Otto Gierke zum Doktorjubiläum, 21. August 1910 (Breslau 1910; repr. Frankfurt 1969)) 73–109.



A. Pérez Martín, ‘Jacobo de Ardizone’, in Juristas universales 1.448–50.

F. Roggero, ‘Iacopo di Ardizzone’, in DGI (2013) 1.1101.

G. Dilcher, ‘Das lombardische Lehensrecht der Libri Feudorum im Europäischen Kontext: Enstehung – zentrale Probleme – Wirkungen’, in Ausbildung und Verbreitung des Lehnswesens im Reich und in Italien im 12. und 13. Jahrhundert, K.-H. Spiess, ed. (Vorträge und Forschungen 76; Ostfildern 2013) 41–91.

H. Lange, Glossatoren 278–82.

P. Weimar, ‘Jacobus de Ardizone de Broilo’, in LMA (1991) 5.256.

P. Weimar, ‘Die Handschriften des Liber feudorum und seiner Glossen’, RIDC, 1 (1990) 35–46.

G. Moschetti, ‘Introduction’, in Il Cartularium veronese del Magister Ventura del secolo XIII, G. Moschetti, ed. (Napoli 1990) lv n46, lvii, lx, cx–cxiv.

E. Conte, ‘Un sermo pro petendis insigniis al tempo di Azzone e di Bagarotto’, RSDI, 60 (1987) 71–86.

E. Cortese, ‘Legisti, canonisti e feudisti: la formazione di un ceto medievale’, in Università e società nei secoli XII–XVI: Atti del IX Convegno Internazionale di Studi (Pistoia, 20–25 settembre 1979) (Pistoia 1982) 233.

G. Sancassani, Le imbreviature del notaio Oltremarino da Castello a Verona (1244) (Roma 1982) 70–73, 80–81, 89–91, 99–100, 104–105, 192–93.

I. Soffietti, ‘Introduzione’ to Corpus glossatorum iuris civilis 5’, (Torino 1970) iii–vii.

V. Colorni, ‘Le tre leggi perdute di Roncaglia (1158) ritrovate in un ms. parigino (Bibl. nat. Cod. lat. 4677)’, in Scritti in memoria di Antonino Giuffrè (Milano 1967) 1.111–70.

A. Checchini, ‘I consiliarii nella storia della procedura’, in idem, Scritti giuridici e storico-giuridici (Padova 1958) 2.3–65. (Originally printed in an obscure publication in 1909.)

E. Meijers, ‘Les glossateurs et le droit féodal’, TRG, 13 (1934) 129–49. Reprinted in: idem, Études d’histoire du droit, ed. R. Feenstra and H.F.W. Fischer (Leiden 1956–73) 3.261–77.

E. Seckel, ‘Quellenfunde zum lombardischen Lehnrecht, insbesondere zu den Extravaganten-Sammlungen’, in Festgabe der Berliner Juristischen Fakultät für Otto Gierke zum Doktorjubiläum, 21. August 1910 (Breslau 1910; repr. Frankfurt 1969) 47–168.

F. von Savigny, Geschichte 4.80–88.