Archducal

of or relating to an or an archduchy.
Historical Examples

And who are you, signor, that dare thus question the lady of an archducal counsellor?
Blackwood’s Edinburgh Magazine, No. 341, March, 1844, Vol. 55 Various

Various opinions had been expressed of him, but his importance was archducal, dynastic, purely accidental.
Notes on Life and Letters Joseph Conrad

Your gains, lawful and unlawful, are wrested from you by the archducal counsellors, in whose hands you are mere puppets.
Blackwood’s Edinburgh Magazine, No. CCCXLII. Vol. LV. April, 1844 Various

And Fellner had made his home in the quietest quarter of the city, in that quarter which was nearest the archducal hunting castle.
The Case of the Golden Bullet Grace Isabel Colbron, and Augusta Groner

The opera-dancer was as essential to archducal existence as the seventy-seventh quartering on the Hapsburg arms.
Essays in Rebellion Henry W. Nevinson

I can afford to ignore the insults written in Imperial, Royal, and archducal proclamations.
New York Times Current History; The European War, Vol 2, No. 4, July, 1915 Various

There would still be time, perhaps, to reach Vienna before the archducal party should leave for Bosnia.
The Secret Witness George Gibbs

adjective
of or relating to an archduke, archduchess, or archduchy