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The Duchy of Tridentum (Trent) was an autonomous Lombard duchy, established by Euin during the Lombard interregnum of 574–584 that followed the assassination of the Lombard leader Alboin. The stronghold of Euin's territory was the Roman city of Tridentummarker in the upper valley of the Adigemarker, in the foothills of the Alps in northern Italy, where the duchy formed one of the marches of the Lombard Kingdom of Italy. There he shared power with the bishop, who was nominally subject to the Patriarch of Aquileia. In 574–75, Lombard raiding parties pillaged the valley of the Rhône, incurring retaliatory raids into the duchy by Austrasian Franks, who had seized control of the mountain passes leading into the kingdom of Burgundy. Euin was at the head of the army loyal to Authari that went into the territory of the duke of Friuli in Istriamarker, c 589, and he was sent by Agilulf to make peace with the Franks his neighbors, in 591. After Euin's death c 595, Agilulf installed Gaidoald, who was a Catholic, rather than an Arian Christian. After some friction between king and duke, they were reconciled in 600. The separate Lombard duchy of Brescia was united with Tridentum in the person of Alagis, a fervent Arian and opponent of the Lombard king, Perctarit, who was killed in the battle of Cornate d'Addamarker (688).

With the collapse of the Lombard kingdom in 773–74, the duchy of Tridentum passed into Frankish control and was transformed. Its strategic position controlling the Alpine mountain passmarker encouraged the eleventh-century Holy Roman Emperors to invest the Bishop Ulrich II of Trent with temporal powers over a sizable territory, as an independent prince of the empire, with the powers and privileges of a duke. A succession of prince-bishops ruled, except for a few short intervals, until 1802, when the bishopric was secularized and became a part of Austrian Tyrol.


  1. Paul the Deacon, Historia Langobardorum, ii.32 ( on-line text); Henry Wace, A Dictionary of Christian Biography, Literature, Sects and Doctrines, vol. II (1880) s.v. "Euin".
  2. Catholic Encyclopedia, 1912, s.v. "Trent" ( on-line text).
  3. Wace, op. cit.
  4. Historia Langobardorum, iii.9 and 27; iv.10; A.H.D.A. in Wace, op. cit., suggests that Paul's information was obtained from abbot Secundus of Tridentum.
  5. Historia Langobardorum calls him "vir bonus ac fide catholicus", "a good man and of Catholic faith" (iv.10 and 27); Wace, op. cit, s.v. "Gaidoaldus".
  6. Wace, "Gaidoaldus"
  7. In 1004 and 1027 the counties of Bozen/Bolzano and Vintschgau/Val Venosta were added to the Bishop of Trent's territories.
  8. Albert III, the last of the Counts of Tirol (d. 1253), was able to unite the duchies of Trent and Brescia.

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