Written by Hesiod about 700 B.C., the Theogony presents a mythic conception of the universe, based in part on relevant myths from the ancient Near East and in part on common-sense empirical observations of the physical environment.
Hesiod's work describes the world that evolved from void. From Chaos and Gaea to Cronus, the titans and the Olympian gods.
If you are interested in an outline of the Theogony, you might take a look at the second link below, it offers a concise but helpful guide. Also, if you are a visual learner, Carlos Parada's graphical representation of the Theogony is unparalled in its ease of use and completeness.
Primary Characters :
Too many to list in this space. The Theogony addresses all the major gods and goddesses as well as numerous other characters from including the titans and monsters. If you want details just browse the links glossary.
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