928 Henry the Fowler conquers Brandenburg from the Slavs.
948 Otto I the Great founds missionary dioceses of Brandenburg, Havelburg, Ribe, Aarhus, and Schleswig
1134 The House of Brandenburg is founded when Albrecht the Bear is made head of the Nordmark.
1150 Albrecht the Bear inhabits Brandenburg
1150 Neuruppin city founded in Brandenburg, Germany
1157 June 11 Albert I of Brandenburg, also called, The Bear (Ger: Albrecht der B
1252 The Polish land of Lebus is incorporated into German state of Brandenburg, marking the start of Brandenburg's expansion into previously Polish areas (Neumark).
1268 The county of Wernigerode become a vassal state of the margrave of Brandenburg.
1417 Friedrich I Hohenzollern (b. 1372; d. 20 Sep 1440) burgrave of Nuremberg begins to rule as margrave and elector of Brandenburg
1618 The margraves of Brandenburg is granted Polish approval to inherit Ducal Prussia.
1686 Russia, Saxony, Brandenburg and Bavaria join the Holy League against the Ottoman Turkish Empire.
1688 Friedrich I of Prussia becomes rince-elector|Kurf