Mabon is the modern Pagan name commonly used for the autumn equinox. The name entered modern Pagan usage in the twentieth century, while present-day practice draws on equinox balance, harvest thanksgiving, fruit, grain and the visible turn toward the darker half of the year.
Deities associated with Mabon
Mabon ap Modron
A Welsh mythological figure whose name was adopted for the modern Pagan equinox festival; he was not historically an autumn-equinox deity.
Demeter
Greek goddess of agriculture and grain, frequently used in modern harvest symbolism.
Persephone
Greek goddess whose seasonal myth is often read through themes of descent and return; a modern equinox correspondence rather than a historical Mabon cult.
Pomona
Roman goddess associated with fruit trees and orchards, often used in modern autumnal practice.
Historical association vs. modern correspondence
The modern festival name should not be mistaken for evidence of an ancient equinox cult devoted to Mabon ap Modron. Demeter, Persephone and Pomona belong to their own Greek and Roman religious contexts.
Reference
https://en.wikipedia.org/wiki/Wheel_of_the_Year
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