Fortress of Sarkel
Byzantine engineers build the Khazars a fortress on the Don
Around 833, at the Khazar khagan's request, Emperor Theophilos sent the engineer Petronas Kamateros to the Don, where he built the brick fortress of Sarkel, the 'White House'. Sviatoslav took it in 965 and it became the Rus' town of Belaya Vezha; its ruins now lie beneath the Tsimlyansk Reservoir.
Wikipedia (Russian) · Wikipedia (English) · 9th century
Meanwhile around the world (±25 years)
Europe
- 843 Treaty of Verdun — 10 years later
Asia
- c. 850 Prambanan — 17 years later
Alive at the time
- Louis the Pious (aged 55)
- Al-Khwarizmi (aged 53)
- Charles the Bald (aged 10)
- Rurik (aged 3)
- Al-Kindi (aged 32)