The goryō belief drove real policy for centuries: goryō-e, ceremonies to placate angry spirits, were held by the court from the ninth century, and several major festivals including Gion began as them. The three most famous vengeful spirits are Michizane, the exiled Emperor Sutoku, and Taira no Masakado, who declared himself emperor in the east in 939, was killed, and whose severed head is said to have flown from Kyoto back to the Kantō plain. Masakado's kubizuka, his head mound, is the striking modern case: it occupies an extremely valuable plot in Ōtemachi, in the middle of Tokyo's financial district, and it is still there. The Ministry of Finance building on the site burned after the 1923 earthquake and attempts to clear the mound were followed by a run of deaths among officials; occupation forces are reported to have abandoned a bulldozing after accidents. Whether one believes any of it, the plot has never been built on, corporations neighbouring it maintain the site, and salarymen bow to it. It was renovated as recently as 2021.