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Last modified: 2026-10-10 by olivier touzeau
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![[Flag]](../images/f/fr-29-cl.gif)
Flag of Châteaulin - Image by Olivier Touzeau, 26 September 2026
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Châteaulin (5,085 inhabitants, 2,081 ha) is a commune in the Finistère department.
Near the fortified castle, built on an isolated mound, a settlement
began to flourish at the location now known as Vieux-Bourg. To
encourage settlement, the Dukes of Brittany welcomed serfs from the
Crozon Peninsula and the Porzay region, granting them their freedom
after a year and a day of servitude.
Additionally, in the 11th century, Duke Alain Fergent donated part of
his lands—along with salmon fisheries—to the Benedictine Abbey of
Landévennec, which established a priory dedicated to Saint Idunet on
the right bank of the Aulne River. Another settlement, known as
Locyonnet or Loguionnet, grew up around this priory. On the same bank,
where the road from Carhaix arrived, a third settlement, Lostrat, was
established.
The lords of the fortified castle experienced a rapid political rise
during the 11th century. They successively attained the title of Count
of Cornouaille and then, in 1066, that of Duke of Brittany. Around
1250, Duke John the Red (Jean Le Roux) enclosed his ducal estate with
a 32-kilometer-long wall, nicknamed the "Devil's Wall."
Salmon fisheries brought wealth to the parish, whose inhabitants were
nicknamed pen-eok—meaning "salmon heads." Around the 15th century,
the construction of a bridge to replace the various fords across the
Aulne facilitated the creation of a single town named Châteaulin,
uniting the different settlements that had developed along the river.
Formerly a ducal administrative center, the town became a royal
sénéchaussée (a royal judicial district) in 1552 - shortly after
Brittany was united with France in 1532 - with a jurisdiction covering
27 parishes. Châteaulin thus played a significant judicial role, while
slate quarrying and agriculture expanded in importance.
The construction of the canal on the Aulne between 1811 and 1836 led
to the development of Port-Launay and to the expansino of the city.
Urban development continued into the 20th century, spurred by the
growth of the railway network and the Breton road plan. Two viaducts,
built to carry trains across the deep Aulne valley, are distinctive
features of the city's landscape.
Olivier Touzeau, 26 September 2026
The flag of Châteaulin 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 castle with two roofed towers Argent vanned Or, above a
salmon Argent too.
Olivier Touzeau, 26 September 2026
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