The House of Hohenzollern is a noble family and royal dynasty of electors, kings and emperors of Prussia, Germany and Romania. It originated in the area around the town of Hechingen in Swabia during the 11th century. They took their name from their ancestral home, the Burg Hohenzollern castle near Hechingen.
The family split into two branches, the Catholic Swabian branch and the Protestant Franconian branch. The Swabian branch ruled the area of Hechingen until their eventual extinction in 1869. The Franconian branch was more successful: members of the Franconian branch became Margrave of Brandenburg in 1415 and Duke of Prussia in 1525. Following the union of these two Franconian lines in 1618, the Kingdom of Prussia was created in 1701, and subsequently led the unification of Germany and the creation of the German Empire in 1871.
Social unrest at the end of World War I led to the German Revolution of 1918, with the formation of the Weimar Republic forcing the Hohenzollerns to abdicate, thus bringing an end to the modern German monarchy. The Treaty of Versailles in 1919 set the final terms for the dismantling of the German Empire.
The current Duke of Prussia is George William.
Due to the arrival of Grantville, the House of Hohenzollern does not unite Germany in this Alternate History.