Painted by Winterhalter in 1857. Claire-Émilie, marquise de Las Marismas, vicomtesse Aguado, née MacDonell. (October 24, 1817, Algiers - April 23, 1905, Paris). When I first started composing this post, I could find nothing on this lovely woman other than her name and the dates of her birth and death. And then, depending on where I read it, even the date of her death and the spelling of her maiden name varied. As I struggled on, I began getting bits and pieces, mostly from French and Spanish…