List of state leaders in 666

This is a list of heads of state, government leaders, and other rulers in the year 666.

America

• Palenque (Mayas) – K'inich Janaab' Pakal (Pacal II the Great) (615–683)

Asia

• China (Tang dynasty) – Emperor Gaozong (650–683)
• India
  • Chalukyas of Badami – Vikramaditya I (655–680)
  • Eastern Chalukyas – Jayasimha I (641–673)
  • Western Ganga dynasty – Bhuvikarma (654–679)
• Japan (Asuka period) – Emperor Tenji (661–672)
• Khmer Empire – Jayavarman I (657-681)
• Korea (Three Kingdoms)
  • Goguryeo – Bojang (642–668)
  • Silla – Munmu (661–681)
• Tibetan Empire – Mangsong Mangtsen (650–677)

Europe

• Byzantine Empire – Constans II (641–668)
• England (Heptarchy) – Oswiu of Northumbria, Bretwalda
  • Kingdom of East Anglia – Ealdwulf of East Anglia (664–713)
  • Kingdom of Essex –
    • Sighere of Essex (664–683)
    • Sæbbi of Essex (664–694)
  • Kingdom of Kent – Ecgberht of Kent (664–673)
  • Kingdom of Mercia – Wulfhere of Mercia (658–675)
  • Kingdom of Northumbria –
    • Bernicia – Oswiu (642–670)
    • Deira – Interregnum (664–670)
  • Kingdom of Sussex – Æthelwealh (c.660-c.685)
  • Kingdom of Wessex – Cenwalh (643–674)
• Frankish Empire –
  • Austrasia – Childeric II (662–675)
  • Neustria and Burgundy – Chlothar III (655–673)
• Old Great Bulgaria – Batbayan (665–668)
• Lombard Kingdom – Grimoald I of Benevento (662–671)
• Scotland
  • Kingdom of Dál Riata – Domangart mac Domnaill (660–673)
  • Kingdom of Strathclyde –
• Visigothic Kingdom – Recceswinth (649–672)
• Wales -
  • Kingdom of Gwynedd – Cadwaladr (655–682)
  • Kingdom of Powys

Middle East

• Umayyad Caliphate – Muawiyah I (661–680)
• Byzantine Empire – Constans II (641–668)