Mozart wrote the "Concerto for Flute, Harp, and Orchestra in C major" in April 1778, during his seven-month sojourn in Paris.
It was commissioned by Adrien-Louis de Bonnières, duc de Guînes (1735-1806), a flutist, for his use and for that of his eldest daughter, Marie-Louise-Philippine (1759-1796), a harpist, who was taking composition lessons from the composer, at the duke's home, the Hôtel de Castries.
Mozart stated in a letter to his father that he thought the duke played the flute "extremely well" and that Marie's playing of the harp was "magnifique".
Louis-Ernest Barrias (1841-1905) | Mozart child with a violin, 1887 | Musée Fabre