821
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Heads of State
Year of the Metal Ox辛丑( at the beginning of the year metal rat庚子)
Era of Diocletian: 537/538 ( year November )
Syria: 1132/33 ( the year in October )
Events
- The Persian Tahirids win in Eastern Iran / Khorasan and Central Asia de facto independence from the Abbasid caliph.
- Peace treaty between the Tibetan king Thri Relpacen and Tang China in which both sides recognize each other as equals.
- Thomas the Slav gives himself as Emperor Constantine VI. and can be crowned in the Byzantine Empire to the anti-emperor Michael II.
- Ceolwulf I. succeeds his deceased brother Cenwulf as ruler of the Anglo-Saxon Kingdom of Mercia.
Died
- JANUARY 24: Arn of Salzburg, Archbishop ( * after 740)
- Borna, sovereign of the Dalmatian Croats
- Cenwulf, King of Mercia
- Egbert of Lindisfarne, Bishop
- Sclaomir, Samtherrscher the Abodrites
- Theodulf of Orléans, Visigothic scholar, adviser of Charlemagne and Bishop (around 750/760 )