Caelus (or Coelus) is a primordial deity representing the sky, often paired with Tellus (Earth) as a cosmic couple. Though rarely central in Roman myth, he appears in poetic cosmogonies as the origin of divine lineage. Poets invoke Caelus to signify the vastness of the heavens, the source of celestial order, or the ancient roots of Roman religious tradition, especially in works emulating classical epic or philosophical verse.

Caelus (or Coelus) is the Roman personification of the sky, equivalent to Greek Uranus; he is a primordial deity, father of Saturn and grandfather of Jupiter; though less prominent in narrative poetry, Caelus appears in philosophical and cosmological verse (e.g., Lucretius) as the celestial vault; useful as a symbol of cosmic order, divine authority, or the heavens as witness; often paired with Tellus (Earth) in the motif of sacred marriage (hieros gamos); students should note that Caelus is invoked in oaths and foundational myths; his name survives in words like “celestial.”