Sutoku Daitengu

Sutoku Tennō reigned between 1123 and 1142 but was forced to abdicate without exercising real power. In 1156 his confrontation with his brother Go-Shirakawa led to the Hōgen rebellion. After defeat he was exiled to Sanuki where he copied sutras for years and sent them to the capital as an offering of reconciliation. The court rejected the texts fearing curses. According to the Hōgen Monogatari Sutoku bit his tongue and wrote with his blood an oath to become the great demon of Japan to invert the social order. He stopped cutting his hair and nails until he became unrecognizable and died in 1164 transformed into a daitengu. Subsequent disasters were directly attributed to him.

In the Ugetsu Monogatari the monk Saigyō visits Sutoku's tomb in Shiramine and beholds his spirit as an incandescent daitengu that refuses to be appeased. The tengu possesses a long tail and human form with avian features. His blood oath grants him the ability to cause fires and catastrophes that contributed to the fall of the imperial court before the warriors. He is not identical to Sōjōbō of Mount Kurama but a relative of rank within the tengu lineage. His transformation distinguishes him as a vengeful goryō rather than a simple winged demon while retaining influence over natural and political disasters for centuries.

The spirit of Sutoku Daitengu continued to be feared for centuries. In 1868 Emperor Meiji ordered his spirit brought back to Kyoto and consecrated at the Shiramine Jingū shrine before the imperial restoration seven hundred years after his death. This ceremony marked the symbolic closure of ancient dynastic grudges. The sources Toriyama Sekien in Konjaku Gazu Zoku Hyakki and Ueda Akinari in Ugetsu Monogatari document his figure as a vengeful daitengu. His kinship relation with Sōjōbō and other mountain tengu is maintained as a rank bond within Japanese folklore without being confused with them. The tengu and goryō taxon reflects his dual nature as vengeful spirit and winged demon.