Maria Josepha of Austria, daughter of Maria Theresa of Austria and Francis I, Holy Roman Emperor. She was engaged to Ferdinand IV of Naples (the crown of which is in the background), but she died of smallpox at the age of 16 before the marriage. [Anton Raphael Mengs / Museo Nacional del Prado -- Public domain -- http://commons.wikimedia.org/wiki/File:Maria Josepha of Austria - Anton Raphael Mengs - 1767.jpg]