Later, during the North German Confederation (1867-71), the same title was used for an office functioning as head of state. According to the constitution, the holder of this presidency was always the king of Prussia. The king was also "Bundesfeldherr", federal commander-in-chief. The constitutional changes of 1870-71 renamed the North German Confederation as the German Empire; the title and function of "Bundespräsidium" remained, but were now combined with the additional title "Deutscher Kaiser".