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Heads of State · Nekrolog

Michael's army defeats Thomas the Slav;  Miniature from the Chronicle of Constantine Manasses
The Byzantine Emperor Michael II can defeat the opposing Emperor
Thomas the Slav , take prisoner and execute him.
823 in other calendars
Armenian calendar 271/272 (turn of the year July)
Ethiopian calendar 815/816
Buddhist calendar 1366/67 (southern Buddhism); 1365/66 (alternative calculation according to Buddha's Parinirvana )
Chinese calendar 58th (59th) cycle

Year of the water hare癸卯 ( at the beginning of the year water tiger 壬寅)

Chula Sakarat (Siam, Myanmar) / Dai calendar (Vietnam) 185/186 (turn of the year April)
Iranian calendar 201/202 (around March 21)
Islamic calendar 207/208 (May 15/16)
Jewish calendar 4583/84 (9/10 September)
Coptic calendar 539/540
Roman calendar from urbe condita MDLXXVI (1576)

Diocletian's era : 539/540 (New Year November)

Seleucid era Babylon: 1133/34 (turn of the year April)

Syria: 1134/35 (turn of the year October)

Spanish era 861
Vikram Sambat (Nepalese Calendar) 879/880 (turn of the year April)


Politics and world events

Franconian Empire

Byzantine Empire

Bulgarian Khans Omurtag had to break off the siege of Constantinople , tries to restart the siege, but is defeated by the troops of Emperor Michael II in May and pushed back to a few permanent places in Thrace .

The Capture and Punishment of Thomas the Slav, Madrid Illuminated Manuscript of the Skylitz
  • October: Thomas the Slav is handed over to Emperor Michael II by his own people and executed by impalation. His co-regent Anastasios suffers the same fate. Two supporters of Thomas, Choireas and Gazarenos Colony , can stay in Asia Minor for a few more months.
  • Saracens from the western Mediterranean invade the island of Crete, part of the Byzantine Empire .

North africa

British Islands

First documentary mentions




The Imam Reza Shrine in Mashhad