I would suggest purusing the Shemhamforas. It’s a Renaissance period BookGrimoire of Moses, and technically should be a companion for any student of angelic or goetic magick.
[i]From the Book:
After this there are four parts of the earth which are the most subtle light of the spiritual world. Likewise four [triplicities of] hierarchies: 1) Seraphim, Cherubim, [and Thrones]; 2) Dominations, Powers, and Virtues; 3) [Principalities,] Archangels, and Angels; 4) Spirits and souls of persons which come before God. These parts of the world has also four angels that stand upon the four corners of heaven; they are Michael, Raphael, Gabriel, Uriel; four angels stand for the elements, namely, Seraph, Cherub, Tharsis, Ariel; four highly enlightened men full of the light of God.6"
Thus, technically there are the 4 angels of the ruling quarters, and under them another 4 'sub’angels that rule the actual element itself.
Think of it as a management system.
Then, if you’d perhaps like to delve into the quarters and keepers of the darkness/demons:
[i]From the Book:
“In the fourth quarter of the world there is darkness, instituted for conÂdemnation in wrath and for punishment. Four princes of devils are injurious in the four elements: Samael, Azazel, Azael, Mahazael,14 four princes of devils over the four quarters of the earth, Oriens, Paymon,15 Egyn, Amayon.”
http://www.esotericarchives.com/moses/67moses2.htm
Enjoy!