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)
*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

*Avars - Bayan III, Avar Khagan (660–680)
*England (Heptarchy) - Oswiu of Northumbria, Bretwalda
**East Anglia - Ealdwulf, King of East Anglia (663-713)
**Essex - Sighere, King of Essex (664-683)
**Kent - Ecgberht, King of Kent (664-673)
**Mercia - Wulfhere, King of Mercia (654-673)
**Northumbria - Oswiu, King of Northumbria (654-670)
**Sussex - Aethelwalh, King of Sussex (c.660-c.685)
**Wessex - Cenwalh, King of Wessex (648-674)
*Franks (Merovingian Dynasty)
**Neustria - Clotaire III, King of Neustria (658-673)
**Austrasia - Childeric II, King of Austrasia (662-675)
*Great Bulgaria - Khan Kubrat, (632-668)
*Lombard Kingdom - Grimuald, King of the Lombards (662 - 671)
*Scotland
**Dál Riata - Domangart mac Domnaill, King of Dál Riata (660-673)
**Strathclyde - Dumnagual II, King of Alt Clut (658-694)
*Visigothic Kingdom - Reccesuinth, King of the Visigoths (649-672)

Middle East

*Ummayad Caliphate - Muawiyah I, Caliph (661-680)
*Byzantine Empire - Constans II, Byzantine Emperor (641-668)