When did Marie de France die?

Marie de France ("Mary of France") was a poet evidently born in France and living in England during the late 12th century. Virtually nothing is known of her early life, though she wrote a form of Anglo-Norman. She also translated some Latin literature and produced an influential version of Aesop's Fables. Marie de France was one of the best Old-French poets of the twelfth century. She identifies herself only as Marie who originated in France. Nothing else definite is known about her. (from Wikipedia)/