Bonjour Michael,

I know several other descendants of this family: Sonja McCarthy, Greg Osborn, and Van Coulon.

I would say these are most likely in St. Louis Cemetery 1. There were a few people who continued to be buried in the old St. Peter graveyard, but only rarely.

The link below is to a survey of the tombs done by the University of Pennsylvania.
http://cml.upenn.edu/nola/

I checked it, although it would probably not reflect the named Mathieu, Devaux, etc.

It would be very hard to find this tomb without knowing what name was on it. Even knowing that is no guarantee, as quite few early tombs were torn down or fell down.

I would say they are in St. Louis 1.

Joyeux Noel!

Jari Honora