- The thesis is focused on relations between Sweden and Brandenburg in the years 1660 - 1701. Although Sweden is considered as an empire practically all over the 17th century, a new, important power rises in its neighbourhood, namely Brandenburg-Prussia, and this rise is finished by the Royal coronation of Fredrick I in 1701. Main part of the thesis is dedicated to the political and military relations, less to the cultural relations. Even other countries, following and protecting their interests in the Baltic region, are taken into account, especially Denmark and France. The aim of the thesis is to analyse relations between Sweden and Brandenburg and to try to find an answer on the question, if Sweden's focus on its internal problems and reforms contributed to the rise of Prussia or if there is no direct connection between these two tendencies. Key terms - Swedish Imperial Period, regency, Charles XI, Charles XII, Louis XIV, Elector Fredrick William, Elector Fredrick III, Scanian War, foreign policy, Baltic Sea hegemony