What year did XXX dissolve?
Duchy of Modena and Reggio
The Duchy of Modena and Reggio (Italian: Ducato di Modena e Reggio, Latin: Ducatus Mutinae et Regii) was a small northwestern Italian state that existed from 1452 to 1859, with a break during the Napoleonic Wars (1796--1814) when Emperor Napoleon I reorganized the states and republics of renaissance-era Italy, then under the domination of his French Empire.
1859