User blog comment:B214/Volume 23 discussion blog/@comment-31299378-20170515215652/@comment-31137559-20170516052501

Actually the original Satans and their descendants were royalty. But the original Satans died and their descendants and their supporters were driven to the far edges of the Underworld or were just chilling out like Rizevim. The Baels are nobility. Being ranked higher than the other houses doesn't make them royalty. All of the houses of the 72 Pillars ARE nobility not royalty. They don't rule the 72 Pillars. And if the Baels are royalty then why is the rank of Great King not the highest? Nobility-wise the rank of Great King is the highest. But in the Underworld, the rank of Satan is the highest. Royalty refers to those that rule the Underworld and those are(well were) the Satans.

And princess can refer to a daughter of a family with a high status. The actual definition of a princess is one who is a daughter of a monarch but the term is used loosely. It would basically be used by commoners to refer to a daughter of a family with very high status. That's what makes Rias, Sona, Seekvaira, and Ravel princesses. To the commoners, they are basically royalty because of their high status. Thus that makes them princesses.