E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Empyrean.
According to Ptolemy, there are five heavens, the last of which is pure elemental fire and the seat of deity; this fifth heaven is called the empyrean (from the Greek en-pur, in fire). (See HEAVEN.)
1
Now had the Alnighty Father from above,
From the pure empyrean where He Sits
High throned above all height, bent down his eye.