Pierre Haour and his wife Pierrette were close friends of Ravel. They owned an elegant château at Châteauneuf-en-Thymerais, called "La Bijeannette", about a hundred kilometres south-west of Paris, and it was here that Ravel stayed for some months in 1920 while he was waiting for his new home at "Le Belvédère" to be ready. While he was there, he worked on a Duo (later the Sonate pour violon et violoncelle), and began work on L'Enfant et les sortilèges.
In earlier years, Pierre Haour had been host to the Apaches; they met "le mardi chez Pierre Haour, dont la table est ouverte aux membres de l'Apachie" (in Colette  p.107). Maurice Delage referred to "la fidèle et obstinée tendresse d'un des plus purs entre nous, qui devait disparaître le premier, Pierre Haour" (ibid p.104).
Ravel once described Pierrette as "athée comme moi" (Orenstein, , letter 164). After Pierre's death, he took an avuncular interest in their son Roger (Orenstein, , letters 173, 305).