Death of Frederick William III of Prussia and accession of Frederick William IV

Background. Frederick William III had ruled Prussia since 1797, navigating the Napoleonic Wars and implementing administrative reforms. He held the title of sovereign prince of Neuchâtel in personal union. His death in 1840 marked the end of this era. The succession was direct, passing to his eldest son, who had previously participated in the Wars of Liberation. The new king faced immediate diplomatic tensions regarding the Rhine border.

Succession and Immediate Actions. Upon Frederick William III's death, Frederick William IV assumed the throne. He maintained the personal union with Neuchâtel, which was a canton in the Swiss Confederation. In August 1840, he enacted an amnesty releasing political criminals and easing press censorship. To reconcile with Catholics, he authorized the Cologne Cathedral Building Association and established a Catholic affairs department in the Ministry of Culture.

Political Context. The succession occurred during the Rhine Crisis, where France demanded the Rhine as its eastern border. Frederick William IV did not seek a constitutional monarchy but preferred a state governed by Christian estates, focusing on Provincial Estates founded in 1823. This approach contrasted with parliamentary legislatures, reflecting his conservative vision for Prussia's governance structure.