On the dual nature of the horned god of Traditional Witchcraft. Now, here we are specifically examining a very British form of horned god, evident in Welsh, Cornish, Scottish and English fairy tale and myth.
From Pwyll and Anwynn, to Bucca Dhu and Bucca Gwidder, to the Holly and Oak King, and so on and on, we see these pairings matching up with halves of the year, and halves of life and death. Pwyll is the upperworld Welsh hero and he trades places with Anwynn the underworld god. Bucca Dhu is the devil, the storm god, the autumn and winter, Bucca Gwidder is pleasant weather and plentiful harvests. In Scottish legend we likewise have the White Fairy and the Black Fairy that battle endlessly. From the English we have The Oak King rules in the summer, the Holly in the winter. And also in English legend Herne or even Odin brings in the wild hunt as fall approaches.
Finally we see in the heretical dual observance forms of witchcraft, Cain and his Brother Abel. The dark brother brings death and the light brother falls to him right after the harvest, perfectly bringing in the timing of Autumn again.
Now the mystery is, that this is more than just seasons of the year, times of day and night, and life and death. There is something to say about facing both these sides of ourselves, what we keep hidden away and why, and what is bright and lucid to us. I and Other—for a traditional witch must look into the mirror and traverse the Other.
Sources: Traditional Witchcraft: A Cornish Book of Ways by Gemma Gary
Wondertales from Scottish Myth and Legend by Donald Alexander McKenzie
Mabinogion by Lady Charlotte Guest
Call of the Horned Piper by Nigel Jackson
Qutub and Azoetia by Andrew Chumbley