845    The first King of all Brittany, Nominoe defeats the Frankish king Charles the Bald at the Battle of Ballon near Redon.

1364    Battle of Auray: English forces defeat the French in Brittany; end of the Breton War of Succession.

1499    Publication of the ''Catholicon'' in Tréguier (Brittany). This Breton-French-Latin dictionary was written in 1464 by Jehan Lagadeuc. It is the first Breton dictionary as well as the first French dictionary.

1797    A naval battle is fought between a French ship of the line and two British frigates off the coast of Brittany during the French Revolutionary Wars ends with the French vessel running ashore, resulting in the death of over 900.

1978    Supertanker ''Amoco Cadiz'' splits in two after running aground on the Portsall Rocks, three miles off the coast of Brittany, resulting in the 5th-largest oil spill in history.