Saint-Brieuc is named after a Welsh monk Brioc, who Christianised the region in the 6th century and established an oratory there. Bro Sant-Brieg/Pays de Saint-Brieuc, one of the nine traditional bishoprics of Brittany which were used as administrative areas before the French Revolution, was named after Saint-Brieuc. It also dates from the Middle Ages when the "pays de Saint Brieuc," or Penteur, was established by Duke Arthur II of Brittany as one of his eight "battles" or administrative regions.
The town is located by the English Channel, on the Bay of Saint-Brieuc. Two rivers flow through Saint-Brieuc: the Goued/Gouët and the Gouedig/Gouédic.
Other towns of notable size in the département of Côtes d'Armor are Gwengamp/Guingamp, Dinan, and Lannuon/Lannion all sous-préfectures.
In 2009, large amounts of sea lettuce, a type of algae, washed up on many beaches of Brittany, and when it rotted it emitted dangerous levels of hydrogen sulphide. A horse and some dogs died and a council worker driving a truckload of it fell unconscious at the wheel and died.
Langueux, La Méaugon, Plérin, Ploufragan, Trégueux and Trémuson.
Saint-Brieuc is one of the towns in Europe that host the IU Honors Program.
The Cemetery of Saint Michel contains graves of several notable Bretons, and sculptures by Paul le Goff and Jean Boucher. Outside the wall is Armel Beaufils's statue of Anatole Le Braz. Le Goff, who was killed with his two brothers in World War I, is also commemorated in a street and with his major sculptural work La forme se dégageant de la matière in the central gardens, which also includes a memorial to him by Jules-Charles Le Bozec and work by Francis Renaud.
The town of St. Brieux in Saskatchewan, Canada is named after Saint-Brieuc of Brittany. It was founded by immigrants from this region in Brittany. It was settled in the early 1900s.
Inhabitants of Saint-Brieuc are called briochins in French.
In 2008, 3.98% of primary school children attended bilingual schools.
The Saint-Brieuc railway station, situated on the Paris–Brest railway, is connected by TGV Atlantique to Paris Montparnasse station, journey time is about 3 hours.
There are no scheduled air services from Saint-Brieuc – Armor Airport.
Saint-Brieuc is hometown of many personalities:Octave-Louis Aubert (1870–1950), editor
Maryvonne Dupureur (1937–2008), athlete, Olympic 800m silver medallist
Émile Durand (1830–1903), music theorist and teacher
Léonard Charner (1797–1869), senator and Admiral of France
Auguste Villiers de l'Isle-Adam (1838–1889), symbolist writer
Louis Auguste Harel de La Noë (1852-1931), engineer
Célestin Bouglé (1870–1940), philosopher
Louis Guilloux (1899–1980), writer
Henri Nomy (1899–1971), admiral
Patrick Dewaere (1947–1982), actor
Louis Rossel (1844-1871) - Army officer and Communard
Florent Du Bois de Villerabel, archbishop forced to resign after France's liberation in World War II
Mamadou Wague, footballer
Raymond Hains (1926-2005), artist
Anaclet Wamba (1960–), boxer
Yelle (Julie Budet) 1983 – present, musician
Roland Fichet 1950 – present, Author, Philosopher
Saint-Brieuc préfecture of the Côtes-d'Armor is twinned with : Aberystwyth, Wales, United Kingdom
Agia Paraskevi, Greece
Goražde, Bosnia and Herzegovina