An angelic order of the third hierarchy, traditionally associated with leadership, peoples, realms, and the administration of divine ministries.
Principalities form the highest order of the third hierarchy. In medieval theology they are associated with leadership and, in some accounts, with the governance of peoples or kingdoms.
Etymology
From Latin principatus, “principality, rule, leadership.”
Sculptor Notes
Because crowns, sceptres, and armor can equally belong to saints, kings, and archangels, the specific identity of a Principality should be grounded in the surrounding program rather than inferred from a single regal attribute.
References
https://www.newadvent.org/summa/1108.htm