Johannes De Deo (died 1267)

Johannes de DeoHis name translates at "John of God". His given name may be spelled Iohannes or Joannes. Other Latin surnames besides ''de Deo'' include ''Bononiensis'', ''Ictus'' and ''Yspanus''. In other languages his name is translated
''João de Deus'' (Portuguese), ''Juan de Dios'' (Spanish), ''Giovanni di Dio'' (Italian) and ''Jean de Dieu'' (French). Se
Iohannes de Deo
in Rolf Schönberger (ed.), ''Alcuin: Infothek der Scholastik'' (Universität Regensburg, 2022). ( – 15 March 1267) was a Portuguese priest, judge and scholar of canon law who taught for over twenty years at the University of Bologna. He was a prolific writer.

Life

Johannes was called '' Hispanus'', meaning a native of the Iberian Peninsula.Patrick Colquhoun, ''A Summary of the Roman Civil Law'' (William Benning and Co., 1849), 175–176. He was born in Silves during the brief period when it was held by King Sancho I of Portugal between 1189 and 1191.Christie's, Live Auction 6704, The Count Oswald Seilern Collection, Lot 7
Johannes de Deo (c.1190–1267), Liber poenitentiarius de cautela simplicium sacerdotum in seven books, in Latin, decorated manuscript on vellum
(2003). He refers to himself as a priest, and seems to have been ordained in Lisbon before studying at the University of Bologna.Miguel Carlos Vivancos Gómez
"Juan de Dios Hispano"
'' Diccionario biográfico español'' (Real Academia de la Historia, 2018). He studied canon law and possibly civil law at Bologna from 1223 until 1229. His main teacher was the archpriest Zoen.A. Domingues de Sousa Costa, "Joannes de Deo", ''New Catholic Encyclopedia'', 2nd ed. (Gale, 2002), 7:882–883. He was a professor at Bologna from 1229 until at least 1255.Sam Worby, ''Law and Kinship in Thirteenth-Century England'' (The Boydell Press, 2010), 34–36. He appears to have been a doctor of both laws.Osvaldo Cavallar and Julius Kirshner, ''Jurists and Jurisprudence in Medieval Italy: Texts and Contexts'' (University of Toronto Press, 2020), 191 n42. The titles he uses of himself are ''doctor decretorum'' (doctor of decrees) and ''utriusque juris professor'' (professor of both laws).

In 1241, Johannes acquired a canonry in the cathedral of Lisbon. In 1247, he arbitrated a dispute in Bologna. He served as a judge on several occasions, including on occasion as a judge delegate of Popes Innocent IV and Alexander IV. By March 1260, he had left Bologna to become archdeacon of Santarém in the diocese of Lisbon. He continued to work as an arbitrator and judge in Portugal. One of his cases involved the monastery of Santa Cruz in Coimbra and the philosopher Pedro Julião, the future Pope John XXI. Johannes died in Lisbon on 15 March 1267.

Works

Johannes wrote numerous works in Latin on canon law:

*''Casus decretalium cum canonibus concordantes''or ''Concordatis'' (before 1238), mentioned in the ''Liber iudicum''
*''Breviarium decretorum'' or ''Decretum abbreviatum'' (before 1238), mentioned in the ''Liber iudicum'', little more than a table of contents for the '' Decretum''
*''Distinctiones super toto iure canonico'' (before 1238), mentioned in the ''Liber iudicum''
*''Arbor versificata'' (before 1238), mentioned in the ''Liber iudicum'', a collection of mnemonic doggerel verse for the aid of his students, popular and widely copied
*''Chronica a tempore beati Petri hucusque qualiter subcreverit ecclesia inter Turbines et Procellas'' (before 1238), mentioned in the ''Liber iudicum''
*''Liber iudicum'' (1236 or 1246), a treatise on judicial process divided into four books on judges, plaintiffs, defendants and advocates
*''Epistulae canonicae de decimis'' (30 May 1240)
*''Apparatus'' 'super toto corpore''ref name=PC/> ''decretorum'' (before 1241)
*''Notabilia cum summis super titulis decretalium'' 'et decretorum''ref name=PC/> (September 1241), dedicated to Cardinal Gil Torres
*''Casus legum canonizatarum quae inter canones continentur et unde babeant ortum in libris legalitbus'' (1 September 1242)
*''Summa super quatuor causis decretorum'' (1243), a continuation of the ''Summa'' of Huguccio which contains a list of his earlier works
*''Liber dispensationum'' (28 August 1243), dedicated to the Dominican and Franciscan orders, contains a list of his earlier works and was submitted to Innocent IV for corrections
*''Liber pastoralis'' (August 1244), dedicated to Cardinal Guglielmo Fieschi
*''Principium decretalium'' (after 1245), an important source for the history of the
*''Liber poenitentiarius'' (or ''poenitentialis'') ''de cautela simplicium sacerdotum'' (28 October 1247), a penitential dedicated to Bishop and heavily reliant on the ''Summa de casibus poenitentiae'' of Raymond of Peñafort, is divided into seven books containing a list of 112 sins and their corresponding penances, all cited to authoritative canonsRob Meens, ''Penance in Medieval Europe, 600–1200'' (Cambridge University Press, 2014), p. 212.
*''Liber quaestionum'' (6 September 1248), dedicated to Cardinal Ottaviano Ubaldino
*''Cavillationes'' or ''Liber cavillationum'' (2 September 1246), contains a dedication to Guglielmo Fieschi added after 1248 and a list of thirteen of his earlier works
*''Concordantiae decretorum cum titulis decretalium'' (after 1248)
*''Liber opinionum'' (1251), submitted to Innocent IV for corrections in October 1251
*''De abusibus contra canones'' ( n.d.), an appendix to the ''Liber poenitentiarius''
*''Catalogus haereticorum''
*''Commentum super novellis decretalium''
*''De electione''
*''Flos decretorum''
*''Lecturae super decretalibus'', readings of the ''Decretals''
*''Liber primarius de varii juris pontifici materiis''
*''Liber distinctionum''
*''Quaestiones de processu canonico''
*''Summa de sponsalibus''
*''Summa moralis''
*''Summula super decimis ecclesiasticis'', a letter to the Dominican order requesting preaching on the duty to tithe with a prologue addressed to Alexander IV and the College of Cardinals
*''Tabula decreti''
*''Tabula decretorum''

In addition, some glosses on the ''Arbor actionum'' of John Bassianus are attributed to Johannes de Deo. Johannes dedicated several of his works to Zoen. Although his work as a whole is not very original, it is valuable to historians for its citations of sources. It was more highly regarded and circulated widely up to the end of the 15th century. There are many manuscripts that carry his work. Johannes Andreae had a low opinion of the ''Arbor versificata'', which he said was so difficult and obscure as to make known things unknown. William Durantis relied heavily on Johannes.

Johannes argued that the Crusades were just wars, that is, wars justified by the right of defence under natural law.Sohail H. Hashmi and James Turner Johnson, "Introduction", in Sohail H. Hashmi (ed.), ''Just Wars, Holy Wars, and Jihads: Christian, Jewish, and Muslim Encounters and Exchanges'' (Oxford University Press, 2012), 7. His ''Liber poenitentiarius'' became the new standard for penitentials.

Few of Johannes' works have been printed. An exception is ''Principium decretalium'', which has been edited by Hermann Kantorowicz.

References

{{reflist, 30em

12th-century births
1267 deaths
People from Silves, Portugal
University of Bologna alumni
Academic staff of the University of Bologna
Canon law jurists
13th-century Latin writers
13th-century Roman Catholic priests
Portuguese Roman Catholic priests
Canons (priests)
Archdeacons