岡山県の魔法神社に奉られている牛馬の守護神で、「キュウモウ狸」と呼ばれるたぬきの神様。江戸時代、大勢のキリスト教の宣教師が南蛮船に乗って渡来してきた時にそれに紛れて一緒にやってきて、日本中を放浪した末に岡山の銅山の廃坑跡に棲みついたという。月夜の晩には牛鍬の先を叩きながら「サンヤン、サンヤン」と歌い踊りまわっていたそうだ。

A deity worshipped in the Okayama Prefecture at the Mahou shrine, as a protector of horses, cows and beasts of burdens. He(?) is also known as Kyuumou-danuki, a tanuki who became a shinto deity.

When Christian missionaries came to Japan during the Edo period (*1) on "nanban trade":https://en.wikipedia.org/wiki/Nanban_trade ships this tanuki hid among them and got into Japan. He roamed the land and eventually found a home in an abandoned copper mine in Okayama.
He would come out during moonlit nights, grab a cattle plow and sing ”sangyang, sangyang” while dancing.
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*1: To be exact, it was right before the beginning of the Edo period.

The name "mahou" (魔法) was given before the word was used as a translation for "Western sorcery". The name is thought to be derived from ”Marici's Dharma” (摩法) by the locals.
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