Last modified: 2026-10-10 by olivier touzeau
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![[Flag]](../images/f/fr-22-te.gif)
Flag of Tréguier - Image by Olivier Touzeau, 24 September 2026
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Tréguier (Breton: Landreger - 2,294 inhabitants on 152 ha) is a port
town in the French department of Côtes-d'Armor. It is the capital town
of the province of Trégor.
Tréguier owes its existence to the Welsh monk Tugdual (also known as Pabu), who, according to legend, was elected Pope. In the final years of the 5th century, he founded a monastery named Lan Trecor - or Landreger in Breton - a place name that, from the 14th century onwards, gave its name to both the town and its inhabitants, the Trécorois.
Consecrated as a bishop around 542, Tugdual became one of the seven founding saints of Brittany, and Tréguier became a stop on the Tro Breiz, a pilgrimage honoring these seven saints (Corentin, Patern, Pol Aurélien, Tugdual, Brieuc, Samson, and Malo). The Tro Breiz connects the seven bishoprics (Vannes, Quimper, St-Pol-de-Léon, Tréguier, St-Brieuc, Dol-de-Bretagne, and St-Malo), with one stage completed each year.
In 848, Nominoé, King of Brittany, transformed this monastic see into a secular bishopric extending from Morlaix to Lézardrieux; he established its seat in Tréguier, thereby making it the historic capital of the Trégor region. Tréguier was completely destroyed by the Vikings in the 9th century and abandoned by its inhabitants, leaving the episcopal see vacant.
A man named Gratien began rebuilding the cathedral around 970. This time, it was dedicated to Tugdual (the previous wooden structure had been dedicated to the Apostle Andrew, the town's original patron saint). All that remains of this second cathedral is the Romanesque tower known for reasons unknown as the "Hasting Tower."
Tréguier was granted town status in 1412. The medieval period saw the construction of the current cathedral (1339–1435), followed by the cloister (1450–1479).
The renown and veneration of Saint Yves (1253–1303) () - canonized as early as 1347 as the first official Breton saint - brought great prestige to Tréguier, which rapidly became a pilgrimage site after his death. Many prominent figures came to pay their respects, including Charles de Blois, Du Guesclin, Anne of Brittany (already Queen of France at the time of her visit in September 1505), and Francis I in 1518.
Tréguier’s intellectual influence began to emerge in the 14th century with the opening of the Collège de Tréguier in the Latin Quarter of Paris, established to accommodate students from the Tréguier region. Under the reign of Henry II, it was transformed into the Collège de France.
In May 1485, Brittany’s third printing press opened in Tréguier - following those in Bréhand-Loudéac (December 1484) and Rennes (March 1485) - serving as further evidence of the town's intellectual and artistic vitality. Among the works printed there was the Catholicon (1499), a trilingual dictionary in Breton, French, and Latin. Having already been looted by the English in 1346, Tréguier—which had sided with Henry IV - was ravaged once again between 1589 and 1592 by the Duke of Guise’s League forces. In recognition of the hardships endured for his cause, the King arranged for the Estates of Brittany to be held in the small town in November 1607.
Throughout this period, Tréguier experienced limited economic and commercial growth, despite the significant asset of its port. It was primarily a center of intellectual and religious life, whereinstitutions proliferated: the Saint Francis convent on the left bank of the Guindy (1483), a boys' college (established in the 16th century), the Ursuline convent (1625, for girls' education), the Augustinian convent (1654, for nursing nuns), a seminary run by the Lazarists (1655), the Sisters of the Cross convent (1666, also for girls' education), and the Paulines (1699, for the education of poor girls).
The Revolution saw the end of the bishopric and its feudal jurisdictions following the National Assembly's decision to retain only one bishopric per department (1790). However, in 1852, the name "Tréguier" was appended to that of the Saint-Brieuc bishopric.
The 19th century was a significant period for the town's economic development, marked by the construction of the Saint-François footbridge over the Guindy River in 1834 (for pedestrians and horses) and the first Canada Bridge over the Jaudy River between Trédarzec and Tréguier in 1835
The writer Prosper Mérimée, tasked with a mission regarding French heritage, initiated major restoration work on the cathedral starting in 1841.
The arrival of the railway in 1905 finally ended the town's isolation. Although its population declined, the town remained prosperous until the early part of the century's second half, thanks to port activity - specifically the export of early produce and cereals and the import of timber and wine - and the development of tourism. The new Canada Bridge (the third) was inaugurated in 1954, a few years after railway operations ceased. A marina with over 300 berths was built in the late 1970s.
Olivier Touzeau, 24 September 2026
The flag of Tréguier is based on the city's coat of arms. Source: Rault, Philippe, Les drapeaux bretons de 1188 à nos jours, [rau98] pp. 60 and 64, quoted on emblemes.free.fr.
The coat of arms is blazoned:
Azure a vessel sails and rigging Argent, surmounted at dexter of an
inescutecheon of the field charged with three fleurs-de-lis Or (France
moderne) and at senester of an inescutcheon of ermine plain
(Brittany).
Olivier Touzeau, 24 September 2026