You may have heard the autumn equinox called Mabon, especially in modern Pagan and Wiccan traditions. It is often described as an ancient Celtic harvest festival.
But the history is a little more complicated.
So, what is Mabon?
Today, Mabon is a modern Pagan name for the autumn equinox, which takes place around 21–23 September each year.
The name comes from Mabon ap Modron, a figure from medieval Welsh mythology. His name can be understood roughly as “Divine Son,” while Modron means “Divine Mother.”
Mabon also appears to have connections with Maponos, a Celtic deity known from Roman-period inscriptions in Britain and Gaul.
This gives the name genuine roots in ancient Celtic and Welsh mythology—but that doesn’t mean that ancient Celts celebrated a festival called Mabon.
Did the ancient Celts celebrate Mabon?
There is no good historical evidence that they did.
Ancient Celtic communities certainly observed seasonal changes and had agricultural and harvest traditions. However, we don’t have ancient sources describing an autumn-equinox festival called Mabon.
The idea of calling the autumn equinox “Mabon” belongs to modern Paganism, rather than to a documented ancient Celtic tradition.
When did the autumn equinox become Mabon?
The change happened surprisingly recently.
During the 1970s, American Wiccans and other modern Pagans began developing and popularising the Wheel of the Year—the cycle of eight seasonal festivals now familiar in many Pagan traditions.
One person associated with naming the autumn equinox Mabon is American Wiccan and writer Aidan Kelly.
The name gradually became established, and by the late 20th century, Mabon was widely used within modern Pagan and Wiccan communities as the name for the autumn equinox.
Why was Mabon chosen?
The choice drew on the older Welsh mythological figure Mabon ap Modron.
This gave a modern seasonal celebration a name with connections to Celtic mythology, even though the festival itself wasn’t an ancient Celtic festival called Mabon.
This is an important distinction:
The mythology is old; the use of the name Mabon for the autumn equinox is modern.
What about ancient harvest traditions?
That doesn’t mean that autumn and harvest celebrations are modern.
People living in pre-Christian Europe depended heavily on agriculture, so the changing seasons and the completion of the harvest were naturally important.
Different communities had their own customs, ceremonies and festivals connected with agriculture, food and the changing seasons.
In Britain and Ireland, we also have much later traditional harvest customs, including Harvest Home, which celebrated bringing in the crops.
What we should be careful about is combining all of these traditions and calling them an ancient festival called “Mabon.” The evidence doesn’t support that.
Mabon: ancient mythology, modern festival
The simplest way to understand Mabon is this:
Mabon is a modern Pagan festival inspired by older mythology and seasonal traditions.
The name comes from the ancient Welsh mythological figure Mabon, while the use of that name for the autumn equinox developed in the 20th century, particularly during the 1970s.
So when you celebrate Mabon today, you’re taking part in a modern Pagan tradition with ancient mythological influences, rather than recreating a festival we can prove was celebrated by the ancient Celts.
And that doesn’t make the celebration any less meaningful. Modern traditions can draw inspiration from the past while also developing into something new.
