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Brandenburg is bordered by Mecklenburg-Western Pomerania in the north, Poland in the east, Saxony in the south, Saxony-Anhalt in the west and Lower Saxony in the northwest.
Brandenburg was one of the German states to switch 1539 to Protestantism in the wake of the Reformation, and generally did quite well in the century following, as the dynasty expanded its lands to include the Duchy of Prussia in 1618 and along the lower Rhine Duchy of Cleves ( 1614) and elsewhere.
Brandenburg was still the most important portion of the kingdom (and the state was often referred to informally as Brandenburg-Prussia) but for the purposes of accuracy, the continuation of this history can be found at Prussia.