Napoleon's northern-Italian client kingdom, proclaimed when he crowned himself King of Italy in Milan Cathedral (17 March 1805), evolved from the preceding Italian Republic (itself the 1802 successor to the Cisalpine Republic). Napoleon reigned as king in name while his stepson Eugène de Beauharnais governed as viceroy from Milan; the kingdom covered Lombardy, the Veneto (from 1806), Emilia-Romagna, and the Marche, and served as a proving ground for Napoleonic administrative and legal reform in Italy.
Collapsed with the wider Napoleonic order in early 1814: as Austrian and allied forces advanced and Napoleon's position in France crumbled, Milan's Senate voted to dissolve the kingdom in April 1814. Its territory was partitioned by the 1815 Congress of Vienna chiefly between Austrian-ruled Lombardy-Venetia and the restored Papal States, Duchy of Modena, and Duchy of Parma.
Dedicated monograph on the Napoleonic Kingdom of Italy's institutions and army across its lifespan; confirmed on Open Library.
Classic dedicated study of the kingdom's final collapse; confirmed on Open Library, pairs with Schneid for the kingdom's full arc.