Political map of Europe & the Mediterranean 23 September 1830 (Belgian Revolution): The overthrow of King Charles X in France in July 1830 (July Revolution) inspired revolutions across  Europe (Revolutions of 1830), most notably in the United Kingdom of the Netherlands, where the Catholic Belgians rebelled against the Protestant Dutch (Belgian Revolution). With Great Power approval, the Kingdom of Belgium was declared in 1831; although it was not until 1839 that the Netherlands would recognize the new country (Treaty of London (1839)).