*Friedrich der Grosse* byAndy Warhol (1928-1987) 

The House of Hohenzollern
Descendants of Friedrich VI, Count von Zollern (-1298)
Stammbaum der Hohenzollern
Die offizielle Website des Hauses Hohenzollern

The House of Brandenburg
Descendants of Friedrich I, Elector of Brandenburg (1371-1440)

The House of Prussia
Descendants of Friedrich III-I, King in Prussia (1657-1713)

Book Sources

VICTORIAN LINKS

THE GERMAN EMPIRE
Eine Reise in das Deutsche Kaiserreich ( 1871 - 1918 )
Deutsches Kaiserreich
Geschichte und Bilder aus einer glaenzenden Zeit

Die Preussen (G)
Chronik eines deutschen Staates

Prussian Castles and Gardens

Prussian (German), British and Greek Royal Palaces and travel
in Royal Yachts occupy this Victorian lady's life after an eventful visit to India
from England as a children's governess with a final move to Burma 
as the wife of a District Commander