In Denmark, since Christian IX, most of the male relinquished their titles when they married commoners. If they had married royally, they all would have remained princes, but after the first generation been styled Highness.
In Sweden, HRH Prince remained until marriage to a commoner demanded they give up titles. All living males outside of the current King's children/grandchildren are products of morganatic marriages.
Germanic nations tend to do titles forever. Even the most far-flung distant cousin of the Emperor in the male line of Habsburg is still HI&RH Archduke of Austia, etc.
In Russia, title were in pertuity also, but got lesser as rank the more generations from the Tsar: Children/ grandchildren were HIH Grand Duke, next generation HH Prince of Russia, after that HSH Prince of Russia (except the eldest son of each HH Prince was also a HH Prince - just to add to the confusion).
: To clarify: were the highest non-reigning
: titles (i.e. prince/princess, with the
: qualification of Highness/Royal Highness)
: indefinite in the dynastic males lines, in
: the Scandinavian houses -- in the days
: before female succession became legalized,
: and the lines became limited (e.g. King
: Christian X of Denmark, the current king of
: I know that Russia and the United Kingdom
: imposed limitations (i.e. children and
: grandchildren through sons of sovereigns).
: But to the best of my knowledge, titles were
: indefinite in all the German and Austrian
: houses, to those persons of legitimate
: male-line descent. This, of course, meant
: in addition equal marriages.
: Case in point: Prince Eugen of Bavaria was
: (in the male line) only a
: great-great-grandson of a king. Although
: his paternal great-grandfather (Prince
: Luitpold) was a DE FACTO sovereign, serving
: as regent of the kingdom, Eugen's nearest
: direct ancestor in the male line who was a
: sovereign on a DE JURE basis was King Ludwig
: I. Yet, I believe he was styled with the
: title of Prince, with the qualification of
: Royal Highness. Is this correct?
: Perhaps, in the royal houses of Sweden and
: Denmark, males far down in the succession
: tended to marry morganatically ...