Cepheus and Cassiopeia are king and queen of Ethiopeia. The name Ethiopeia is a cognate of Greek aither, Latin aether, shortened to ether. There are masculine and feminine derivatives from the word 'aether'; the Greek word Aither,
Latin spelling Aether is masculine, and may relate to Cepheus; and the feminine Cassiopeia to Aithre, Latin spelling Aithra. Aither was the ancient Greek Protogenos (first-born elemental god) of the bright, glowing upper air of heaven. His female counterpart was Aithre, "Titanis of the Clear Blue Sky, mother of the Sun and Moon."
Aether or ether was understood to be the element itself; and aethra is the glow of the aether; according to Isidore
"The ether (aether) is the place where the stars are, and signifies that fire which is separated high above from the entire world. Of course, ether is itself an element, but aethra (i.e. another word for ether) is the radiance of ether; it is a Greek word."
The aether (ether) was a general word for the sky, kindle, burn, shine, the regions of space beyond the earth's atmosphere; the heavens (not the same as Ouranos, Uranus, Caelum). Aether was also the element believed in ancient and medieval civilizations to fill all space above the sphere of the moon and to compose the stars and planets
The precise nature of the aether is an open question. Scientists in the late 19th century failed to detect the aether because it could not be measured, and concluded that the space was filled with void, or was a vacuum. Some think that what is now called 'quintessence' or 'dark-matter' is what the ancients meant by aether
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