The formula the thread uses seem to be based on continuous monarchy. For example, the United Kingdom was formed in 1707, but Great Britain has been a monarchy longer than that. I don't know about Norway but using their criteria, Canada should be listed as the 12th oldest monarchy because it was...
In Canada, each province is also a monarchy. Canada has been officially continuously a monarchy since 1534. In Canada we inherited the French, English, British and Canadian crowns. King Louis XIV is officially recognised as the longest reigning monarch of Canada. Canada is the only country in...
From a dynastic perspective these former collateral families are still technically part of the Yamato dynasty, since they often married within each other the dynastic bloodlines would have been kept intact and legitimate, although they have been disinherited. All it takes is some sort of...