George Barr McCutcheon - Beverly Of Graustark

Beverly Of Graustark is the second book in the Graustark series.
Lorry and his wife, the princess, made their home in Washington, but
spent a few months of each year in Edelweiss. During the periods spent
in Washington and in travel, her affairs in Graustark were in the hands
of a capable, austere old diplomat--her uncle, Count Caspar
Halfont. Princess Volga reigned as regent over the principality of
Axphain. To the south lay the principality of Dawsbergen, ruled by young
Prince Dantan, whose half brother, the deposed Prince Gabriel, had been
for two years a prisoner in Graustark, the convicted assassin of Prince
Lorenz, of Axphain, one time suitor for the hand of Yetive. (Project Gutenberg)