Roman Catholic Diocese of Tréguier

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The former Breton and French diocese of Tréguier existed in Lower Brittany from about the sixth century, or later, to the French Revolution. Its see was at Tréguier, in the modern department of Côtes-d'Armor.

The title continues in the contemporary diocese of Saint-Brieuc and Tréguier.

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St. Tudgual (Tugdual, Tudual),^[1] said to be the nephew of St. Brieuc (who had emigrated from Cardigan), was a bishop who came to Brittany from overseas (Scotland^[2]),^[3] and was appointed by his uncle Brieuc at the close of the fifth century as superior of the monastery of Tréguier, which Tudual had founded. The biography of St. Tudual, composed after the middle of the ninth century, relates that Tudual, wishing to confirm his authority by royal approval, travelled to the court of King Childebert I, who ordered him consecrated Bishop of Tréguier.^[4] Louis Duchesne, however, argued that it was King Nomenoe who, in the middle of the ninth century, had the monastery of Tréguier raised to the dignity of an episcopal see.^[5]

Numerous synods were held at Tréguier in the fourteenth and fifteenth centuries,^{[weasel words]} and passed regulations for the discipline of the Breton churches.^[6]

• Catholic Church in France
• List of Catholic dioceses in France

• Gams, Pius Bonifatius (1873). Series episcoporum Ecclesiae catholicae: quotquot innotuerunt a beato Petro apostolo. Ratisbon: Typis et Sumptibus Georgii Josephi Manz. pp. 641–642. (Use with caution; obsolete)
• Eubel, Conradus, ed. (1913). Hierarchia catholica, Tomus 1 (second ed.). Münster: Libreria Regensbergiana. (in Latin) p. 494.
• Eubel, Conradus, ed. (1914). Hierarchia catholica, Tomus 2 (second ed.). Münster: Libreria Regensbergiana. (in Latin) p. 254.
• Eubel, Conradus (ed.); Gulik, Guilelmus (1923). Hierarchia catholica, Tomus 3 (second ed.). Münster: Libreria Regensbergiana. {{cite book}}: |first1= has generic name (help) p. 317.
• Gauchat, Patritius (Patrice) (1935). Hierarchia catholica IV (1592–1667). Münster: Libraria Regensbergiana. Retrieved 6 July 2016. pp. 342.
• Ritzler, Remigius; Sefrin, Pirminus (1952). Hierarchia catholica medii et recentis aevi V (1667–1730). Patavii: Messagero di S. Antonio. Retrieved 6 July 2016. p. 387.
• Ritzler, Remigius; Sefrin, Pirminus (1958). Hierarchia catholica medii et recentis aevi VI (1730–1799). Patavii: Messagero di S. Antonio. Retrieved 6 July 2016. pp. 413–414.

• Chadwick, Nora Kershaw (1969). Early Brittany. Cardiff: University of Wales Press. ISBN 9780900768262.
• Duchesne, Louis (1910). Fastes épiscopaux de l'ancienne Gaule: II. L'Aquitaine et les Lyonnaises. Paris: Fontemoing. second edition (in French)
• Hauréau, Barthélemy (1856). Gallia Christiana: In Provincias Ecclesiasticas Distributa... De provincia Turonensi (in Latin). Vol. Tomus Quartus decimus (XIV). Paris: Typographia Regia. pp. 1119–1142, Instrumenta, pp. 271–274.
• Jean, Armand (1891). Les évêques et les archevêques de France depuis 1682 jusqu'à 1801 (in French). Paris: A. Picard. pp. 454–458.
• Poquet du Haut-Jussé, B.A. (1947). "Les évêques de Bretagne dans la renaissance religeuse du XVIIe siècle". Annales de Bretagne (in French). 54: 30–59. doi:10.3406/abpo.1947.1847. Retrieved 2 September 2016.

48°47′N 3°14′W / 48.79°N 3.23°W / 48.79; -3.23