The Principalities (Principality for one), also known as Princes, Princedoms or Rulers, are the third Choir of the third Angelic Sphere. These Angels that guide and protect nations, or groups of people, and institutions such as the Church. The Principalities preside over bands of angels and charge them with fulfilling the divine ministry. There are some who administer and some who assist. They are usually controlled by the chief angel Erebiel.
They are those who possess a sovereign character with power of command within the divine order. Principalities Angels collaborate with the Powers in the management of human politics, receiving orders directly from the Dominions Angels.
As for how large they really are, the Principalities themselves are enormous. They make up entire planes with their bodies, as we live within a larger entity, that is the Universe itself, it all just an expansion of souls, within bigger souls, who are within ever bigger souls, only the little sleeping human mind can not comprehend this.
The Principalities out of this Earth, the principalities in the Universe’s spheres, are rulers of their own dimensions, planets, stars, nebula, and planes, all which exist within them. Then there are smaller angels who make up the smaller hosts, the planets and galaxies, themselves. Even our air is full of smaller souls, who work together to make up several layers of Earth’s dimensions, and those dimensions make up the larger angels of the Earth’s body itself.
They are superior for a superiority of fortitude, strong in performing miracles, in attracting the celestial gifts and in redistributing them after receiving them. It is said that at the end of the world the powers of the heavens will be disrupted, because for their activity wonderful things will be accomplished on the elements.
They are shown wearing a crown and carrying a scepter, with massive metallic wings of a dimly gold color. They also are shown to be wearing humanoid masks of various silver and gold colors, and rarely do they ever reveal their faces.
Their duty also is said to be to carry out the orders given to them by the angels of the upper sphere and bequeath blessings to the material world. Their task is to oversee groups of people. It was from this Order that the Angel who aided David in his task of slaying Goliath was thought to have come. As beings related to the world of the germinal ideas, they are said to inspire living things to many things such as art or science.
Together with the Archangels, they are in close and continuous contact with men, designating and choosing individuals suitable for governing, administering and fostering trade and military affairs. Every region, province, nation, city or village has its own Principality. While still absolutely pure, wise, and powerful, these angels are furthest from God in the angelic hierarchy, and so are better able to communicate with man in ways we can understand and even withstand.
Additionally, St. John was directed to write letters to the angels of the seven churches. These angels charged with guiding and leading certain parts of Christ’s Mystical Body are Principalities. They were also the angels to listen the prophecies of the Moirai sisters and give them to God.