I love traditional Port Salud, but it's rare even in France. Nearly all is now industrially made and nothing like the original. The monks who originally made it sold the trademark in the 1950s.
You can read the history on the Spruce Eats but take anything it says with a bucket of salt. They claim that it
Quoteoriginated in the Loire Valley, in a Trappist monastery in the Brittany region of France, during the middle of the 19th century.
That would be amazing given that the Loire Valley isn't in a Trappist monastery anywhere! It isn't even in Brittany, at all. It is east of Brittany.