The counties of Sweden (Swedish: Sveriges län) are the top-level geographic subdivisions of Sweden. Sweden is today divided into 21 counties; however, the numbers of counties has varied over time, due to territorial gains/losses and to divisions and/or mergers of existing counties. This level of administrative unit was first established in the 1634 Instrument of Government on Lord Chancellor Count Axel Oxenstierna's initiative, and superseded the historical provinces of Sweden (Swedish: landskap) in order to introduce a more efficient administration of the realm. At that time, they were what the translation of län into English literally means: fiefdoms. The county borders often follow the provincial borders, but the Crown often chose to make slight relocations to suit its purposes.