Jōgan earthquake and tsunami
A tsunami floods Sendai and returns 1,142 years later
In 869 an earthquake off northeastern Japan sent a tsunami kilometres inland across the Sendai plain. The chronicle Nihon Sandai Jitsuroku reports a thousand drowned; the disaster repeated itself 1,142 years later, in 2011.
Wikipedia (Russian) · Wikipedia (English) · 9th century
Meanwhile around the world (±25 years)
Eastern Europe & Russia
- c. 862 Calling of the Varangians — 7 years earlier
- 882 Oleg takes Kiev — 13 years later
Africa
- 859 Fatima al-Fihri founds al-Qarawiyyin — 10 years earlier
Alive at the time
- Charles the Bald (aged 46)
- Rurik (aged 39)
- Oleg the Wise (aged 24)
- Alfred the Great (aged 20)