Masakado fought his uncles for land, called himself the new emperor, and his head mound in Tokyo moved the Finance Ministry

Kind 1 and kind 2. Taira no Masakado was the son of Taira no Yoshimochi. The Konjaku monogatarishu says his uncles seized lands he was due to inherit from his father. Other accounts give a quarrel over a woman. Kunika died in 935 in the fighting. In 939 Masakado attacked the provincial headquarters of Hitachi, took Shimotsuke and Kozuke, and called himself the new emperor. In 940 he was defeated and killed by Fujiwara no Hidesato and Taira no Sadamori, Kunika's son, who took his head to Kyoto. The legend says his head flew home from Kyoto and came down at Shibasaki, now Otemachi, where villagers buried it. In 1307 the monk Shinkyo set up a stone there. After the 1923 earthquake the Ministry of Finance put a temporary building over the mound. Finance Minister Seiji Hayami died of illness in 1926, and 13 other officials died over two years; people blamed Masakado. The ministry removed the building and held rites. In 1940, 1,000 years after his death, lightning burned the ministry and other offices. In 1945 a bulldozer clearing the site for the US occupation overturned and killed its driver, and the plan was dropped. The mound is a Tokyo historic site. It was renovated in 2020 and 2021 and stands among office towers.