Original: Viareggio remained under the control of the Austrians until 1817 when, as part of the agreements from Congress of Vienna, Mary Louis of Bourbon was assigned the new Duchy of Lucca.
Simplified: 1815/1847 Viareggio remained under the control of the Austrians until 1817 when, as part of the agreements from Congress of Vienna, Maria Luisa di Borbone was assigned the new Duchy of Lucca.