List of state leaders in 837

See also:

[edit] Asia

Bohai/Balhae - Da Yizhen/Dae I-jin, King of Bohai/Balhae (830-857)
China (Tang Dynasty) - Wenzong, Emperor of Tang China (826-840)
Gurjara - Mihira Bhoja I, Pratihara King of Gurjara (c. 836-886)
Japan (Heian Period) - Emperor Nimmyō, emperor of Japan (833-850)
Silla - Huigang, King of Silla (836-838)

Al-Andalus - Abd-ar-rahman II, Emir of Cordoba (822-852)
Asturias - Ramiro I, King of Asturias (842-850)
Benevento - Ralchedis I, Prince of Benevento (839-851)
Bulgaria - joint rulers
- Malamir, Khan of Bulgaria (831-852)
- Presian, Khan of Bulgaria (836-852)
Dál Riata -
1. Drust, King of Dalriada (834–837)
2. Eoganan I, King of Dalriada (837–839)
East Anglia¹ - Æthelstan, King of East Anglia (826–839)
England - Egbert of Wessex, Bretwalda (802–839)
Frankish Empire -
- Louis the Pious, Holy Roman Emperor (816-840)
- Lothair I, Holy Roman Emperor (823-855)
Mercia - Wiglaf, King of Mercia (830–840)
Northumbria¹ - Eanred, King of Northumbria (810–841)
Ireland -
- Nial Caille, High King of Ireland (832–844)
- Turgesius of Norway, High King of Ireland (832–845)
Papal States - Gregory IV, Pope (827-844)
Picts -
1. Drust, King of the Picts (834–837)
2. Uen, King of the Picts (837–839)
Strathclyde - Arthgal f Dyfnwal, King of Strathclyde (816–872)
Venice -
1. Giovanni I Participazio, Doge of Venice (829-837)
2. Pietro Tradonico, Doge of Venice (837-864)
Wales - Merfyn Frych ap Gwriad, King of Gwynedd (825–844)

Though East Anglia, Northumbria and Mercia are traditionally perceived to have been in the heptarchy they were largely independent kingdoms until its conquest by the Danes in 869 and 867, respectively - where Mercia was conquered by Wessex in 874. All other members of the heptarchy had been conquered by Wessex and by this time had no form or king.