List of state leaders in 666

665 state leaders - Events of 666 - 667 state leaders - State leaders by year

Africa

America

• Mayas - Pacal II, Ruler of Palenque (615–683)

Asia

• China (Tang Dynasty) - Gaozong, Emperor of China (650–683)
• India
  • Chalukyas of Badami - Vikramaditya I (655–680)
  • Eastern Chalukyas - Jayasimha I, King (641 – 673)
  • Western Ganga Dynasty - Bhuvikarma (654–679)
• Japan (Asuka Period) - Tenji, Emperor of Japan (661–672)
• Khmer Empire - Jayavarman I (657-681)
• Korea (Three Kingdoms)
  • Goguryeo - Bojang, King of Goguryeo (642–668)
  • Silla - Munmu, King of Silla (661–681)
• Tibet - Khri-mang-slon-rtsan, Emperor of Tibet (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)
    • Sebbi of Essex (664–694)
  • Kingdom of Kent - Ecgberht of Kent (664–673)
  • Mercia - Wulfhere of Mercia, King of Mercia (658–675)
  • Northumbria -
    • Bernicia - Oswiu, King of Bernicia (642–670)
    • Deira - Interregnum (664–670)
  • Kingdom of Sussex - Aethelwalh (c.660-c.685)
  • Wessex - Cenwalh, King of Wessex (643–674)
• Frankish Empire -
  • Austrasia - Childeric II, King of Austrasia (662–675)
  • Neustria and Burgundy - Chlothar III, King of Neustria (655–673)
• Great Bulgaria - Batbayan, Khan of Bulgaria (665–668)
• Lombard Kingdom - Grimoald I of Benevento (662–671)
• Scotland
  • Dál Riata - Domangart mac Domnaill, King of Dál Riata (660–673)
  • Kingdom of Strathclyde -
• Visigothic Kingdom - Recceswinth (649–672)
• Wales -
  • Kingdom of Gwynedd - Cadwaladr (655–682)
  • Kingdom of Powys

Middle East

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