What banking group, founded in 1818, sponsors Club Sportive Sedan Ardennes?
CS Sedan Ardennes: Club Sportif Sedan Ardennes, commonly referred to as CS Sedan or simply Sedan (] ), is a French association football club based in Sedan. CS Sedan Ardennes:  Sedan is sponsored by Invicta France and Caisse d'Épargne, the latter being one of France's largest banks. Groupe Caisse d'Épargne: Groupe Caisse d'épargne is a French semi-cooperative banking group, founded in 1818, with around 4700 branches in the country.
Groupe Caisse d'épargne