The coat-of-arms is that of Charles-Louis de Biaudos, comte de Castja, who was appointed ambassador to the court of Stockholm by King Louis XV in 1727, after a distinguished military career, having taken part in the battles of Nijmegen (1702) and Malplaquet (1709), and in the sieges of Douai and Le Quesnoy (1712). He served with distinction as ambassador in Stockholm for eleven years, and died in 1755, aged seventy-two
King Fredrik of Sweden is known to have presented the count with two small bronze cannons cast with the count's coat-of-arms, and these were still in the hands of his descendants in the last century
See Le Chevalier de Courcelles, Histoire Gnalogique et Hraldique des Pairs de France...., Paris, 1822, vol. II, pp. 7-8