Abstract: The article is generally devoted to the guarantees of consistent execution of law by the representatives of the 'prosecutor's position' in the Governorate of the former Duke of Courland and the Governorate of the Princess Anna of Brunswick-Lüneburg. The subject of the research is the regular patterns of changing the government in the Russian Empire, determination of the places of the  'Governorate of the Former Duke of Courland' and the 'Governorate of the Princess Anna of Brunswick-Lüneburg' in the system of government of the Russian Empire, guarantees of consistent execution of legislation in the Russian Empire, the priority of prosecutor's position in guaranteeing consistent execution of law, the list of public offices and official positions there, the role of particular public offices and officials in guaranteeing consistent execution of law in the Russian Empire, prosecutor's relations to other officials (fiscals, master of requests, etc.). The historical-legal and comparative-legal methods of research used have allowed the author to descibe the legalization system of the Russian Empire and make conclusions based on this analysis. Taking into account that the 'Governorate of the Former Duke of Courland' and the 'Governorate of the Princess Anna of Brunswick-Lüneburg' were the elements of the system of governmet of the Russian Empire, it is possible to make an assumption that monarchy is the best form of government for Russia, i.e. the form of government when the government is controlled by one single person having so called 'supreme' power. If the governor has got the charisma and perfect moral standards, he or she can actually make Russia a powerful state.