There are two main sites which will extend your French-Canadian ancestors back in time if they descend from royalty or the nobility:
http://fchsm.org/Announcements/Announcements.html see first paragraph.
http://www.francogene.com/gfna/gfna/998/qrd30.htm
I descend from Anne CONVENT, wife of Philippe AMIOT-VILLENEUVE and daughter of Antoinette de LONGVAL & Guillaume CONVENT. It is through Antoinette de LONGVAL that my noble and royal lines come from (she would be my "gateway" ancestor). Antoinette's parents are Charles de LONGVAL, whose parents are not known at this time, and Louise de JOYEUSE. See the attached lineage chart for her ancestry. I would be glad to hear from anyone who is researching these families.
James P. LaLone
The following will be of interest to those searching French nobility - http://french-genealogy.typepad.com/genealogie/2013/01/the-cabinet-...
Jan 25, 2013
James P. LaLone
Unfortunately the first link is no longer valid, however there are a few other sites which may be of interest:
http://genealogiequebec.info/images/20070317.pdf
http://www.anciennesfamilles.org/listedesnobles/
http://habitant.org/tools/index.htm
See also the book - LA NOBLESSE DE NOUVELLE-FRANCE: FAMILLES ET ALLIANCES, by Lorraine Gadoury
Nov 22, 2015
James P. LaLone
More!!
Update - http://www.shrt.qc.ca/PDF/DGHNCF-Juin%202010.pdf
Arms - http://science-heraldique.com/canada/canada.html#nouvellefrance
Feb 29, 2016