The Hohenzollerns originally came from Franconia, Bavaria, Austria--and several of them joined the Teutonic Knights, and joined in the fun, hunting down the pagan Letts. Albert Hohenzollern was appointed Grand Master of the Order in about 1510, in the hope that he could settle the dispute between the Order and the Polish crown, because his mother was a Jageillon. Well, Albert settled the dispute alright--he became a Lutheran, seized all of Prussia, annexing it to the margravate of Brandenberg. He then successfully defied the Poles in arms. His descendant, Frederick Wilhelm (son of the "Great Elector" of the same name) bargained successfully with the Holy Roman Emperor to be recognized as a king, in return for providing troops for the War of the Spanish Succession. He insisted on being recognized as the King of Prussia, because the Hohenzollerns claimed Prussia by right of conquest, and only held Brandenberg of the Emperor. Once set up independently, there was no end of trouble for Austria and for the rest of Germany.
The Great Elector had made Brandenberg-Prussia a haven for Protestants fleeing Catholic countries, and he'd provide them the wherewithal to farm Prussia (a nightmare task, one wonders if they thanked after they saw their new land). This also attacted French Protestants. In the First World War, the commander of the First Corps, who was responsible for the battle of Tannenberg was von François (Max Hoffman just capitalized on his initiative). Lothar von Arnauld de la Perière was the most successful German submarine commander of the First World War. Prussians both . . .