Celtic art is art associated with various people known as Celts.They speak the Celtic languages in Europe from pre-history through to the medieval period and beyond, as well as art of ancient people whose language is unknown, but where cultural and stylistic similarities lead to believe they are related to Celts. Also related is the Celtic revival art from the 18th century to the modern era, which began as a conscious effort by Modern Celts to express self-identification and nationalism.