Why did Brandenburg and Prussia combine?

Brandenburg situated within the Holy Roman Empire and was one of the electorate that could select the emperors according to the Diet of Nürnberg in 1352. read more

Prussia was the land that the germans had colonized during the teutonic crusades and the hohenzollerns, a german royal house united Prussia with Brandenburg due to its geographical location and not subjected to the holy roman emperors as Prussia was considered a vassal to Poland at that time. read more

Brandenburg-Prussia (German: Brandenburg-Preußen) is the historiographic denomination for the Early Modern realm of the Brandenburgian Hohenzollerns between 1618 and 1701. Based in the Electorate of Brandenburg, the main branch of the Hohenzollern intermarried with the branch ruling the Duchy of Prussia, and secured succession upon the latter's extinction in the male line in 1618. read more