Wiktionary
grand ducal
a. Of; related, pertaining, belonging, or appropriate to; associated with; or characteristic of a grand duke or grand duchess, his or her family, a grand dukedom, or grand duchy.
Usage examples of "grand ducal".
EMPLOYING INDIGNANT PROPRIETY that would have made even the Lady Helena proud, Kailea convinced Leto not to include his son in the grand ducal procession.
During a stay of several months at Weimar he met Goethe, and years afterwards used his reminiscences of the Grand Ducal Court there in his description of Pumpernickel in “.