The angelic hierarchy
It is generally understood that angels were created by the source before humans were added to the universal scheme. When we were created, the lower orders of angels were invited to look after us. Guardian angels came from the lowest ranks of the angelic hierarchy and their evolution depends on ours.
Opinions varies about the various orders of angels, but it is generally considered that they are made up of three hierarchies with three levels in each

The First and highest sphere consists of the Seraphim, Cherubim and
Thrones.
These angels receive direct illumination from source. They transform and step down the light of God to the level where it can be accepted by the lower orders in the universe without burning them out.
Seraphim these are the highest order of angels. Their essence is pure love and they are the heavenly hosts who surround the blazing throne of the Godhead. They constantly sing the praises of the creator, thus maintaining the vibration of creation. They direct the devine energy as it emanates from source.
Cherubim these are the angels of wisdom who spread the light of source. They are the guardians of the stars and the heavens.
Thrones These angels look after and protect the planets.

The second sphere
Dominions are like prefects they over see those under them in the angelic hierarchy. They are channels of mercy. Although the Dominions rarely make direct contact with humans they help to smooth the passage between the spiritual and the material worlds.
Virtues transmit light in a form which we humans can receive. These are the angels that make miracles happen
Powers These are the angels of birth and death, They are present at all births and come to guide all transitions from the earth to the spiritual planes. They help humans who are lost in the astral planes after leaving their bodies.

The third and lowest sphere
Principalities look after and protect cities, nations, multinational corporations and any large structure of people.
Archangels are in charge of the angels. They mostly oversee vast projects for the light. There are millions of Archangels throughout the cosmos. Those most connected with the earth are Arch angel Michael, Arch angel Gabriel, Archangel Charmuel, Archangel Jophiel, Archangel Zadkiel, ArchangelUriel, Archangel Raphael. Because these angels are connected to us and can be called upon to help us in everything we do, I have put a little infomation about each one on site. Please follow this link to find out more.
Angels Angels are our guardians on earth. Our personal angel also keeps our individual record up to date. They love us unconditionally and our lives transform when we connect with them and allow them to help us.