Château de Saint Cosme Gigondas Hominis Fides is where some of the oldest vines of the estate are found with an average vine age of 90-years. The vineyard is located across the road from Le Claux with Miocene-era sand mixed with clay and stones. Incidentally, the soil is identical to that of Château Rayas in Châteauneuf-du-Pape.

The wine is a field blend of predominately Grenache, made with whole cluster fermentation from indigenous yeasts, aged in 20% new 228-liter barrels, and bottled without fining or filtration. Only 10 barrels are produced each year.