Ducal
/ˈduːkl/
Definition 1 of 1
Pro Tip 1/3High Rank
Use 'ducal' when referring to high-ranking nobles, just below a monarch. 
The ducal heir attended the state dinner.
Pro Tip 2/3Specific Context
'Ducal' is often used in historical or aristocratic contexts, not in everyday conversation. 
The ducal archives contain ancient manuscripts.
Pro Tip 3/3Cultural Significance
Understanding 'ducal' may require knowledge of European nobility and their titles. 
Visitors marveled at the ducal coat of arms.