In 1415 Brandenburg was acquired by Burgrave Frederick of Nuremberg, the first member of the Swabian House of Hohenzollern to rule the margraviate [REF].
The Province headed by an Oberpräsident was subdivided into two governorates (Regierungsbezirke) named after their respective capitals, Potsdam in the northwest (Mittelmark, Prignitz and Uckermark) and Frankfurt (Oder) in the southeast (Neumark and Lower Lusatia).