German Romantic poet and author remembered for Romanzen vom Rosenkranz (poems) and Geschichte vom braven Kasperl und dem schönen Annerl (short stories). He also collaborated with his brother-in-law on a collected folk songs volume entitled Des Knaben Wunderhorn.
He was born in Ehrenbreitstein, Germany to a family of half-Italian descent.
He became heavily involved in Catholicism beginning in 1818 and lived for a few years in a monastery. There, he served as secretary to a radically devout nun who lived entirely on holy water and bread.
He married fellow writer Sophie Mereau in October of 1803. His sister, Bettina von Arnim, was also a writer.
His literary work is alluded to in Doctor Faustus, a novel by Thomas Mann.