Louis-Paul Némo, better known by the pseudonym Roparz Hemon, was a Breton author and scholar of Breton expression. He was the author of numerous dictionaries, grammars, poems and short stories. He also founded Gwalarn, a literary journal in Breton where many young authors published their first writings during the 1920s and 1930s.

Breton is a Southwestern Brittonic language of the Celtic language group spoken in Brittany, part of modern-day France. It is the only Celtic language still widely in use on the European mainland, albeit as a member of the insular branch instead of the continental grouping.