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.)

"Now had the Aln ighty Father from above,
From the pure empyrean where He sits
High throned above all height, bent down his
eye." Milton: Paradise Lost, iii. 56-58.