Alt Clut
The ruler of Alt Clut during this time was either King Dumnagual map Riderch (Dumnagaul IV) or King Arthgal map Dumnagual, the exact year of the succession is unknown.
Dál Riata
The ruler of Dál Riata at this time was likely to have been King Domnall mac Caustantín.
Kent
The ruler of Kent was King Æthelwulf (the son of King Ecgberht III of Wessex), who had ruled since 825 and would continue to do so until 858.
East Anglia
The ruler of East Anglia was King Æthelstan, who had ruled since 827 and would continue to do so until 845.
Gwynedd
The ruler of Gwynedd was King Mermin ap Gwriad (Merfyn the Freckled), who had ruled since 825 and would continue to do so until 844.
Northumbria
The ruler of Northumbria was King Eanræd, who had ruled since 810 and would continue to do so until 841.
Fortriu
The ruler of Fortriu was King Óengus II, who had ruled since 820 and would continue to do so until 834.
Wessex
The ruler of Wessex was King Ecgberht, who had ruled since 802 and would continue to do so until 839.