The Luxembourg coup of 1856, also called the putsch of 1856, was a reactionary revision of Luxembourg's constitution on 27 November 1856.[1] 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 powers, and the name has stuck.[2] Aimed at reversing the liberal successes embodied in the 1848 constitution,[1] the major changes enacted by William were undone with the promulgation of a new constitution in 1868, after the Luxembourg Crisis. However, some changes have lasted, such as the creation of the Council of State.[2]