Petty kingdom in Brittany from early Christian times; region retained the name until the Napoleonic redivision of local governments. The territory of Cornouaille ran south of the River Elorn to the Elle, in what is today the south-west Department of Finistère. While the name is similar to Cornwall, Cornouaille does not appear to have been settled by Cornish emigrants, although Cornouaille does appear to be coextensive with the ancient British petty kingdom of Cornubia. Bret. Kernev.