The Coup of 1856 leads to Luxembourg's unilateral adoption of a new, reactionary constitution.

The Luxembourg coup of 1856, also called the putsch of 1856, was a reactionary revision of Luxembourg's constitution on 27 November 1856. Whilst not a true coup d'état or revolution, its detractors dubbed it a "royal coup", as the reigning Grand Duke of Luxembourg, William III, greatly expanded his…