Great stuff. We'll make you a fan of Japanese poetry, after all! I think I've translated that one on Hive long ago. Many haiku refer to it.

There are so many legends about Michizane. One of my favorites links him to Taira no Masakado. Around 940, Masakado declared himself the true emperor and led a rebellion, only to be defeated and beheaded. But the story doesn’t end there: his head was said to cause disasters for centuries afterward. Even today, his grave in Tokyo is maintained and honored by government officials — not out of reverence, but out of fear that neglect might bring misfortune.

The link is Masakado is said to be a reincarnation of the vengeful spirit of Michizane.