

The Empyrean, from The Divine Comedy (1861-1868), Gustave Doré
The Empyrean, “from the Medieval Latin empyreus, an adaptation of the Ancient Greek ἔμπυρος empyrus ”in or on the fire (pyr)”, is a region described in the the Paradiso portion of Dante’s Divine Comedy as a place beyond even the highest spheres of Heaven, the dwelling place of God and angels. In The Divine Comedy, Dante is “enveloped by [a] veil of radiance” as he ascends to the Empyrean.
Some medieval writers conceived of it as a celestial sphere formed from pure fire, but others contested that it burned with light rather than elemental fire, as Thomas Aquinas described in the Summa Theologica: "wholly luminous… that heaven is called the empyrean, not from its fiery heat, but from its brightness".