You might guess from the name that this is a French breed. The Chartreux does have a long history in that country, including being known as the “cat of France” in the 1700s, and was bred even earlier than that by monks of the Carthusian order. (Hence the name; French Carthusian monks were well known for their liqueur called Chartreuse.)
This cat had virtually disappeared by the end of World War II but has experienced a kind of comeback, and rightly so, for this blue (gray, that is) cat with golden
eyes and a sweet disposition deserves to be better known. As seems to be true of the larger breeds, this one is fairly quiet.
