List of heads of state 821

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Africa

• Aghlabids
  • Emir : Ziyādat Allaah I (817-838)
• Idrisids in Morocco
  • Imam : Idris II (791-828)
• Rustamids
  • Imam : 'Abd al-Wahhab ibn' Abd al-Rahman (788-824)

America

• Maya
  • Copan
    • Ruler : U Kit Took ' (820–824)

Asia

• Bagan
  • King : Sawhkinhnit (802–829)

• China
  • Emperor : Tang Muzong (820-824)

• Iberia (Kartlien)
  • King : Ashot I (786-830)

• India
  • Eastern Chalukya
    • King : Vijayaditya II (808–847)
  • Pala
    • King : Devapala (810–850)
  • Pallava
    • King : Thandi Varman (775-825)
  • Pandya
    • King : Varagunan I (800-830)
  • Pratihara
    • King : Param Bhattarak Parmeshwar Nagabhata II (805-833)
  • Rashtrakuta
    • King : Amoghavarsha I (814–878)

• Japan
  • Emperor : Saga (809–823)

• cashmere
  • King : Lalitapida (813–825)

• Khmer
  • King : Jayavarman II (802-850)

• Korea
  • Balhae
    • King : Sungjong Sung (818–832)
  • Silla
    • King : Heondeok (809–826)

• Caliphate of the Muslims
  • Caliph : al-Ma'mūn (813–833)

• Nanzhao
  • King : Meng Quanlisheng (816–823)

• Tibet
  • King : Tri Relpachen (815–836)

Europe

• Bulgaria
  • Khan : Omurtag (814-831)

• Byzantine Empire
  • Emperor : Michael II (820–829)

• England ( heptarchy )
  • East Anglia
    • to Mercia 800-827
  • Essex
    • King : Sigered (798-825)
  • Kent
    • King: Cenwulf (807-821)
    • King: Baldred (821-825)
  • Mercia
    • King : Cenwulf (796–821)
    • King: Ceolwulf I (821–823)
  • Northumbria
    • King : Eanred (810-840)
  • Wessex
    • King : Egbert (802-839)

• Frankish Empire
  • King: Louis the Pious (814–840)
  • Toulouse county
    • Count : Berengar of Toulouse (816–835)

• Italy
  • Papal States
    • Pope : Paschal I (817-824)
  • Venice
    • Doge of Venice : Angelo Partecipazio (810–827)

• Scotland
  • Dalriada
    • King : Oengus (820–834)
  • Strathclyde
    • King : Dumnuagal IV. (Approx. 810 – approx. 840)
  • Picts
    • King : Constantine (789-821)
    • King: Oengus II (821 - 834)

• Spain
  • Asturias
    • King : Alfonso II (791–842)
  • Barcelona county
    • Count : Rampó (820–825)
  • Emirate of Cordoba
    • Emir: al-Hakam I (796-822)

• Wales
  • Gwynedd
    • Prince : Hywel Farf-Fehinog from Caradog (816–825)
  • Powys
    • Prince: Cyngen ap Cadell (808–854)