List of state leaders in 678

This is a list of heads of state, government leaders, and other rulers in the year 678.

Asia

• China (Tang dynasty) – Emperor Gaozong (650–683)
• Japan (Asuka period) – Emperor Tenmu (672–686)
• Korea (Unified Silla) – Munmu (661–681)
• Khmer Empire – Jayavarman I (657-681)

Europe

• First Bulgarian Empire – Asparukh of Bulgaria, Khan of Bulgaria (668–695)
• Byzantine Empire – Constantine IV (668–685)
• England (Heptarchy) –
  • 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 – Hlothhere of Kent (673–685)
  • Kingdom of Mercia – Æthelred of Mercia (675–704)
  • Kingdom of Northumbria – Ecgfrith (670–685)
    • Deira – Ælfwine (670–679)
  • Kingdom of Sussex – Æthelwealh (c.660-c.685)
  • Kingdom of Wessex – Centwine of Wessex (676–685)
• Frankish Empire –
  • Austrasia – Dagobert II (676–679)
  • Neustria and Burgundy – Theuderic III (675–691)
• Frisian Kingdom –
  • Aldgisl (until 678)
  • Redbad (678–719)
• Lombard Kingdom – Perctarit (671–688)
• Scotland
  • Dál Riata –
  • Kingdom of Strathclyde –
• Visigothic Kingdom – Wamba (672–680)
• Wales -
  • Kingdom of Gwynedd – Cadwaladr (655–682)
  • Kingdom of Powys