Salut!
J'allais dire, des trucs et puis j'ai vu China… Plus dur…
To share…in en.
If you can't find Historical names of nobles, look at those of Combat des Trentes.( the Breton ones among them).
Then go in a decent old library, look for Grand Armorial de France, usually very nice black and white old book ( you need to understand the codes for "colours" in heraldry.
All and every noble coat of arms is in there.
They even put old and new, you need old. ( can't remember when it change, might be written too).
Then urban militias, look at towns coats of arms, ex Dinan…
Some of the nobles retinues might have liveries, ( few guys in minis) hardly you will find, but sometimes it might take some things from the arms, colours etc. otherwise they might have their overlord shield in small ,
slopped , in theirs, surrounded by whatever colours they had., handy.
They might even have such a book in Peking central library.
After All, I found in NYPL treasures IN FRENCH one ordinary peon cannot find in ordinary libraries in this country.
It coukd also have been scanned by Gallica or others.
Some ( chose early dates of course)
link
Site of Breton nobility, might help
anb.asso.free.fr
Generally type google: noblesse bretonne
Some have their own sites. No doubt history and coats of arms.
You don't need scores I guess.
Got a bunch here, even from China
link
This one also has pics, but you need to check who was already noble in your period.
link
Here you have some osts detailed with names, 13th cty
link
These chaps went crusading so unless no offsprings, could be in your ost!
link
Happy researching.
Jc