List of state leaders in 657

656 state leaders - Events of 657 - 658 state leaders - State leaders by year

Africa

America

Asia

• China (Tang Dynasty) - Gaozong, Emperor of China (650–683)
• Japan (Asuka Period) - Saimei, Empress of Japan (655–661)
• Korea (Three Kingdoms) -
  • Baekje - Uija, King of Baekje (641–660)
  • Goguryeo - Bojang, King of Goguryeo (642–668)
  • Silla - Muyeol, King of Silla (654–661)
• Khmer Empire - Jayavarman I (657-681)

Europe

• Byzantine Empire - Constans II (641–668)
• England (Heptarchy) - Oswiu of Northumbria, Bretwalda
  • Kingdom of East Anglia - Aethelwold (655–664)
  • Kingdom of Essex - Sigeberht II of Essex (653–660)
  • Kingdom of Kent - Eorcenberht (640–664)
  • Mercia - Oswiu of Northumbria, King of Mercia (655–658)
  • Northumbria -
    • Bernicia - Oswiu, King of Bernicia (642–670)
    • Deira - Alchfrith, King of Deira (655–664)
  • Kingdom of Sussex -
  • Wessex - Cenwalh, King of Wessex (643–674)
• Frankish Empire -
  • Austrasia - Childebert the Adopted, King of Austrasia (656–661)
  • Neustria and Burgundy - Chlothar III, King of Neustria (655–673)
• Great Bulgaria - Khan Kubrat, (632–665)
• Lombard Kingdom - Aripert I (653–661)
• Moravia - Samo, King of the Slavs (623–658)
• Scotland
  • Dál Riata - Conall Crandomna, King of Dál Riata (650–660)
  • Kingdom of Strathclyde - Gwriad (645–658)
• Visigothic Kingdom - Recceswinth (649–672)
• Wales -
  • Kingdom of Gwynedd - Cadwaladr (655–682)
  • Kingdom of Powys