Giacomo da Viterbo

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Giacomo da Viterbo
Archbishop of Naples
Painting in Viterbo.
Church Roman Catholic Church
Archdiocese Naples
Metropolis Naples
See Naples
Appointed 12 December 1302
Installed 1303
Term ended 1307
Predecessor Giovanni de Alatre
Successor Monaldo Monaldeschi
Consecration 1302
Rank Archbishop
Personal details
Birth name Giacomo Capocci
Born c. 1255
Viterbo, Papal States
Died c. 1307
Naples, Kingdom of Naples
Nationality Italian
Denomination Roman Catholic
Previous post Archbishop of Benevento (1302)
Alma mater University of Paris
Feast day 4 June
Venerated in Roman Catholic Church
Beatified 14 June 1911
Saint Peter's Basilica, Kingdom of Italy
by Pope Pius X
  • Archbishop's attire
  • Augustinian habit
  • Book
  • Writers
  • Scholars

Blessed Giacomo da Viterbo (c. 1255 – 1307), born Giacomo Capocci (nicknamed "Doctor speculativus") was an Italian Roman Catholic Augustinian friar and a student of Giles of Rome.[1]

He was born in Viterbo in the Papal States in 1255. He was a professor of theological studies at the University of Paris from 1293 to 1300. He wrote on the relationship between ecclesiastical and temporal power in his book "De Regimine Christiano". It argued that although human power alone is lawful it could be perfected through the influence of a spiritual power alone. Walter Ullmann[2] stated that it was the first "exposition of the concept of the Church".

He became the Archbishop of Benevento after Pope Boniface VIII appointed him in 1302 and he later the Archbishop of Naples in a formal installment in 1303 following his 12 December 1302 appointment. In 1306 he received the task of Pope Clement V in overseeing the cause of canonization of Pope Celestine V. He died in Naples in 1308.

Pope Pius X beatified him on 14 June 1914.


  1. ^ Antony Black, Political Thought in Europe 1250-1450 (1992, p.49): [James and Giles, i.e. Aegidius] were members of the order of Eremitical Augustinians, both had studied at Paris (Aegidius probably under Aquinas, James probably under Aegidius), and rose to be archbishops.
  2. ^ Medieval Foundations of Renaissance Humanism, p.144


  • H. X. Arquillière (1926), Les plus ancien traité de l'Eglise: J., De regimine Christiano
  • R. W. Dyson (1995), James of Viterbo: On Christian Government (De regimine Christiano)

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