His was married again on May 6, 1821 at Florence, Italy to Maria of Saxony (or, more fully, Her Highness Maria Ferdinande Amalia Xaveria Theresia Josepha Anna Nepomucena Aloysia Johanna Vincentia Ignatia Dominica Franziska de Paula Franziska de Chantal, Duchess of Saxony) (April 27, 1796 - January 3, 1865), daughter of Maximilian of Saxony (1759 - 1838) and his wife Caroline of Bourbon-Parma (1770 - 1804). There were no children born of this second marriage.
Shortly afterwards the French arms suffered severe reverses in Italy, and Ferdinand was restored to his territories; but in 1801, by the peace of Luneville, Tuscany was converted into the kingdom of Etruria, and he was again compelled to return to Vienna.
In lieu of the sovereignty of Tuscany, he obtained in 1802 the electorship of Salzburg, which he exchanged by the peace of Pressburg in 1805 for that of Wiirzburg.
The mild rule of Ferdinand, his solicitude for the welfare of his subjects, his enlightened patronage of art and science, his encouragement of commerce, and his toleration render him an honourable exception to the generality of Italian princes.