By the era of Greek philosophy in the 5th century BC, Metis had become the mother of wisdom and deep thought, but her name originally connoted "magical cunning" and was as easily equated with the trickster powers of Prometheus as with the "royal metis" of Zeus. The Stoic commentators allegorised Metis as the embodiment of "prudence", "wisdom" or "wise counsel", in which form she was inherited by the Renaissance.
The Greek word metis meant a quality that combined wisdom and cunning. This quality was considered to be highly admirable, the hero Odysseus being the embodiment of it. In the Classical era, metis was regarded by Athenians as one of the notable characteristics of the Athenian character.
Metis was an Oceanid, the daughters of Oceanus and his sister Tethys, who were three thousand in number, and was of an earlier age than Zeus and his siblings. Metis was the first great spouse of Zeus, and also his cousin. Zeus is himself titled Mêtieta ("the wise counsellor"), in the Homeric poems.
Metis was both a threat to Zeus and an indispensable aid:
Zeus lay with Metis but immediately feared the consequences. It had been prophesied that Metis would bear extremely powerful children: the first, Athena and the second, a son more powerful than Zeus himself, who would eventually overthrow Zeus.
In order to forestall these dire consequences, Zeus tricked her into turning herself into a fly and promptly swallowed her. He was too late: Metis had already conceived a child. In time she began making a helmet and robe for her fetal daughter. The hammering as she made the helmet caused Zeus great pain, and Hephaestus either clove Zeus's head with an axe, or hit it with a hammer at the river Triton, giving rise to Athena's birth. Athena leaped from Zeus's head, fully grown, armed, and armoured, and Zeus was none the worse for the experience.
The similarities between Zeus swallowing Metis and Cronus swallowing his children have been noted by several scholars. This also caused some controversy in regard to reproduction myths and the lack of a need for women as a means of reproduction.
Hesiod's account is followed by Acusilaus and the Orphic tradition, which enthroned Metis side by side with Eros as primal cosmogenic forces. Plato makes Poros, or "creative ingenuity", the child of Metis.
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