After the return of the Karađorđević dynasty to the throne of Serbia in 1903 (following the May Overthrow), under the newly elected king Peter I Karađorđević, a single-chamber National Assembly was introduced, and the new 1903 Constitution was slightly revised version of the 1888 Constitution, annulled by Aleksandar I Obrenović in 1894.
This led to the return of the Karađorđević dynasty to power in Serbia in 1903 (following the May Revolution), under King Peter I Karađorđević, and the introduction of a single-chamber parliament, with the new constitution of 1903 being an updated version of the 1888 constitution that had been abolished by Aleksandar I Obrenović in 1894.