Stephenson:Neal:Quicksilver:811:Bonaventure Rossignol (Neal Stephenson)

From the Quicksilver Metaweb.

Rossignol is a real historical figure, as was his father Antoine. Some information about them may be found in David Kahn's The Codebreakers. But I have not been able to discover much in the way of detail and so virtually everything about him in these books is fictional. They did, however, live in a chateau at Juvisy.