Omphalos in the context of "Delphi"

The Omphalos of Delphi is an ancient marble monument that was found at the archaeological site of Delphi, Greece. According to the Ancient Greek myths regarding the founding of the Delphic Oracle, the god Zeus, in his attempt to locate the center of the Earth, launched two eagles from the two ends of the world, and the eagles, starting simultaneously and flying at equal speed, crossed their paths above the area of Delphi, and so was the place where Zeus placed the stone. Since then, Delphi has been considered by Greeks to be the center of the world, as the site of the original omphalos – "navel of the Earth."

Hesiod's telling of the myth in The Theogony says Zeus set up for veneration at Mount Parnassus the same stone given by his mother Rhea to his father Kronos to eat in his place, which had allowed Zeus to begin his reign.

In the material culture of classical antiquity, a patera (Latin pronunciation: [ˈpatɛra]) or phiale (Ancient Greek: φιάλη [pʰi.á.lɛː]) is a shallow ceramic or metal libation bowl. It often has a bulbous indentation (omphalos, "belly button") in the center underside to facilitate holding it, in which case it is sometimes called a mesomphalic phiale. It typically has no handles, and no feet.

Although the two terms may be used interchangeably, particularly in the context of Etruscan culture, phiale is more common in reference to Greek forms, and patera in Roman settings. The form should be distinguished from a drinking cup with handles, and often a stem, of which the most common type is called a kylix, and a circular platter with a pair of C-handles is not a patera, though a few paterae have single long straight handles (see trulla below).

In astronomy, axis mundi is the Latin term for the axis of Earth between the celestial poles. In a geocentric coordinate system, this is the axis of rotation of the celestial sphere. Consequently, in ancient Greco-Roman astronomy, the axis mundi is the axis of rotation of the planetary spheres within the classical geocentric model of the cosmos.

In 20th-century comparative mythology, the term axis mundi – also called the cosmic axis, world axis, world pillar, center of the world, or world tree – has been greatly extended to refer to any mythological concept representing "the connection between Heaven and Earth" or the "higher and lower realms". Mircea Eliade introduced the concept in the 1950s. Axis mundi closely relates to the mythological concept of the omphalos (navel) of the world or cosmos.Items presented as examples of the axis mundi by comparative mythologists include plants (notably a tree but also other types of plants such as a vine or stalk), a mountain, a column of smoke or fire, or a product of human manufacture (such as a staff, a tower, a ladder, a staircase, a maypole, a cross, a steeple, a rope, a totem pole, a pillar, a spire). Its proximity to heaven may carry implications that are chiefly religious (pagoda, Temple Mount, minaret, church) or secular (obelisk, lighthouse, rocket, skyscraper). The image appears in religious and secular contexts. The axis mundi symbol may be found in cultures utilizing shamanic practices or animist belief systems, in major world religions, and in technologically advanced "urban centers". In Mircea Eliade's opinion: "Every Microcosm, every inhabited region, has a Centre; that is to say, a place that is sacred above all."

Seleucus IV Philopator (Greek: Σέλευκος Φιλοπάτωρ, Séleukos philopátо̄r, meaning "Seleucus the father-loving"; c. 218 – 3 September 175 BC), ruler of the Hellenistic Seleucid Empire, reigned from 187 BC to 175 BC over a realm consisting of Syria (now including Cilicia and Judea), Mesopotamia, Babylonia and Nearer Iran (Media and Persia).