The Holy Roman empire was disolved by Napoleon in the early 19th century, so actually the Hapsburg dynasty of Holy Roman Emporers can be said to have only lasted ~532 years even though they continued on as the emporers of Austria.
How long did the Romanov dynasty last?
Originally posted by Nikolai
a Oldenburg line(Danish IIRC?).
German- though it also produced the Danish royal family and Prince Phillip, the Duke of Edinburgh.