1911 Encyclopædia Britannica, Volume 16… (1911)
“ LA FERTÉ, the name of a number of localities in France, differentiated by agnomens. La Ferté Imbault (department of Loir-et-Cher) was in the possession of Jacques d’Étampes (1590–1668) , marshal of France and ambassador in England, who was known as the marquis of La Ferté Imbault. ”
