The Principalities are one of the nine choirs of Angels. They belong to the Third Sphere, which is the sphere closest to mankind.
"They are the guardian angels of all large groups, from cities and nations to recent human creations such as multi-national corporations. These might more accurately now be called integrating angels. There are many of these beings involved with your particular integrating angel who carries the pattern of a unified global order in its heart." (Ask Your Angels)