Is the royal title of an archduke's son, duke or marquis?

Question

I am writing a story and I don't know much about royal titles. I need quick references on titles and hierarchies etc.

Answer 1

There are archdukes. There are royal duke,marquesses,earls,

viscounts and barons. They are also usually princes as well.The rule is that the eldest son assumes his father's next title down. If your character is His Royal Highness Archduke John,Marquess Field,Earl Grey,Viscount Double,Baron of Rochester, his sone would take the next title down after archduke: Marquess.

A good webiste for you is : http://www.users.chinet.com/~laura/html/...

for British usuage of titles.

Answer 2

I'm pretty sure the only archdukes were in Austo-Hungary.  And I believe their sons were princes.  

Try wikipedia.  There are lists according to country, because some countries ranked things differently.

Answer 3

The title of Archduke (feminine: Archduchess) denotes a rank above Duke and under King, but is too rare and yet has uses too diverse to be given a fixed relative position within the former Holy Roman Empire to which it was restricted. It has only ever been continuously borne by princes of the House of Habsburg and later through the female line into the House of Habsburg-Lorraine. From the 16th century onward, Archduke or its female form, Archduchess, came to be used by all the members of the House of Habsburg, similar to the title Prince in many other royal houses.

In Great Britain, a peer is a noble. The status of nobility does not extend to his wife or to his children.  Unless they possess a noble title in their own right, family members are considered commoners.  It is only when a peer dies that the eldest son inherits his father's title and becomes noble.  Daughters do not usually succeed to their father's titles unless it is specifically included in the creation of the title.

The eldest son of a duke, marquess or earl is allowed to use one of his father's (or mother's, if she is a peeress in her own right) subsidiary peerage titles as a social courtesy, while the eldest son of a viscount or baron is allowed Honourable before his Christian name.  (Note that while the eldest son and heir might have the use of his father's secondary title, his father remains the actual holder of such a title, and that as a courtesy peer the heir is legally not a peer but a commoner.)