heiress presumptive between 1737 and 1740. Archduchess Maria Anna (1738-1789). Maria Theresa's heiress presumptive between 1740 and 1741. Archduchess Maria Caroline (1740-1741). Holy Roman Emperor Joseph II (1741-1790), married Infanta Isabel of Spain (1741-1763), then Princess Marie Josephe of Bavaria (1739-1767); no surviving issue. Holy Roman Emperor from 1765; Archduke of Austria