Prince of Grønbjerg
The Prince of Grønbjerg is the hereditary monarch of the Principality of Grønbjerg, styled Royal Highness.
Powers
"The power of government of the Principality proceeds from the Prince and the People, who are jointly sovereign, and is vested in the Prince, who assumes responsibility for the government and safety of the State and the Nation."
-- Constitution of Grønbjerg, Article III, clause 1
Under the Constitution of Grønbjerg, the Prince is the "source and guarantor" of the statehood of the Principality, referring to the then-Duke's original foundation of Grønbjerg in 1998 and the exercise of the monarchy's power to preserve the nation.
All legislative, judicial, and executive authority in Grønbjerg is vested in the Prince, subject to the laws of the Empire, but in Grønbjerg constitutional theory, the Prince is not an absolute monarch, as he is not the source of authority, but only exercises it under the provisions of the Constitution.
History
The former ducal title of Grønbjerg was raised to Prince on the Restoration of the Imperium in 2000.
Style
The adjective royal rather than princely is frequently used for things connected with the Prince and the royal throne of Grønbjerg (as in the phrase "royal throne of Grønbjerg"), in connection with the style Royal Highness borne by the Prince and certain members of the Princely House. (but not, in this case, "royal house".)
A sovereign or reigning prince would ordinarily be addressed as Serene Highness, as is the prince of Liechtenstein (another small, mountainous country named after its ruling family). The higher-ranked style Royal Highness, however, in addition to belonging to the children of kings and queens, is also traditionally the style of a sovereign Grand Duke, as indeed is the case in Luxembourg (a somewhat larger, flatter country named after a castle). The long-vanished Holy Roman Empire, to which both states once belonged, ranked Grand Dukes (Royal Highness) above Princes (Serene Highness), for reasons which were clearly inadequate and insufficiently thought-through.
Since a Prince of Grønbjerg ranks only below kings and emperors and certainly above any duke, Grand or otherwise, the address Royal Highness is correct.
NB. the above represents, in condensed form, the Grønbjerg interpretation of the matter; the Imperial warrant that made the Duke of Grønbjerg into the Prince of Grønbjerg simply said he would be "Royal Highness", and left it there.
Current monarch
The current Prince is Alan (r. 1998 - ).