Looking for names of extinct French grapes

I’m working on a project about extinct grapes and extremely rare wines.

Can anyone tell me of any extinct French grapes (preferably but not limited to Bordeaux.) I’m aware of the Carmenere being rediscovered in Chile… but I’m looking for history of a grape that is STILL extinct and has been since at least the 1800’s.

A grape that, if found today, would be considered very valuable.

I really appreciate all your time and help.

Pontac is not extinct but very rare. Some still growing in Stellenbosch, South Africa but I’m not aware of anyone producing a varietal Pontac wine any longer.