Alt Clut
The ruler of Alt Clut was King Riderch map Eugein (Riderch II), who had ruled since 780 and would continue to do so until 796.
Dál Riata
The ruler of Dál Riata at this time was likely to have been King Achaius mac Áeda Find.
Dumnonia
The ruler of Dumnonia during this time was either King Oswallt ap Cawrdolli or King Hernam ap Oswallt, the exact year of the succession is unknown.
Mercia
King Offa who had ruled since 757, and ruled jointly with his son, Ecgfrith , from 787.
Northumbria
The ruler of Northumbria at the beginning of 790 was King Osræd II, who had ruled since 788. This year, King Æthelræd I would take over.
Fortriu
The ruler of Fortriu was King Caustantin, who had ruled since 789 and would continue to do so until 820.