The Citadel of Alessandria was built by Carlo Emanuele III King of Sardinia in 1732 and terminated by Napoleon in 1808. With its 74 hectares it represents one of the greatest examples of eighteenth-century fortification with bastions in Europe and one of the few that still exists today. The Citadel was the scene of several important moments for Italian and European history. It was one of the most spectacular forts of the Napoleonic empire and the richest arsenal in Europe. During the Risorgimento era (Italian Unification) it was a symbol of revolutionary movements in favour of the Constitution.