Objection 1. It would seem that the angels were not created in the empyrean heaven. For the angels are incorporeal substances. Now a substance which is incorporeal is not dependent upon a body for its existence; and as a consequence, neither is it for its creation. Therefore the angels were not created in any corporeal place.
Objection 2. Further, Augustine remarks (Gen. ad lit. iii, 10), that the angels were created in the upper atmosphere: therefore not in the empyrean heaven.
Objection 3. Further, the empyrean heaven is said to be the highest heaven. If therefore the angels were created in the empyrean heaven, it would not beseem them to mount up to a still higher heaven. And this is contrary to what is said in Isaias, speaking in the person of the sinning angel: "I will ascend into heaven" (Isaiah 14:13).
On the contrary, Strabus, commenting on the text "In the beginning God created heaven and earth," says: "By heaven he does not mean the visible firmament, but the empyrean, that is, the fiery or intellectual firmament, which is not so styled from its heat, but from its splendor; and which was filled with angels directly it was made."
I answer that, As was observed (3), the universe is made up of corporeal and spiritual creatures. Consequently spiritual creatures were so created as to bear some relationship to the corporeal creature, and to rule over every corporeal creature. Hence it was fitting for the angels to be created in the highest corporeal place, as presiding over all corporeal nature; whether it be styled the empyrean heaven, or whatever else it be called. So Isidore says that the highest heaven is the heaven of the angels, explaining the passage of Deuteronomy 10:14: "Behold heaven is the Lord's thy God, and the heaven of heaven."
Reply to Objection 1. The angels were created in a corporeal place, not as if depending upon a body either as to their existence or as to their being made; because God could have created them before all corporeal creation, as many holy Doctors hold. They were made in a corporeal place in order to show their relationship to corporeal nature, and that they are by their power in touch with bodies.
Reply to Objection 2. By the uppermost atmosphere Augustine possibly means the highest part of heaven, to which the atmosphere has a kind of affinity owing to its subtlety and transparency. Or else he is not speaking of all the angels; but only of such as sinned, who, in the opinion of some, belonged to the inferior orders. But there is nothing to hinder us from saying that the higher angels, as having an exalted and universal power over all corporeal things, were created in the highest place of the corporeal creature; while the other angels, as having more restricted powers, were created among the inferior bodies.
Reply to Objection 3. Isaias is not speaking there of any corporeal heaven, but of the heaven of the Blessed Trinity; unto which the sinning angel wished to ascend, when he desired to be equal in some manner to God, as will appear later on (63, 3).
Source: Summa Theologica (New Advent)