Alba
The ruler of Alba was King Constantine II (Constantine the Middle-Aged), who had ruled since 900 and would continue to do so until 943.
Gwynedd
The ruler of Gwynedd was King Anarawd ap Rhodri, who had ruled since 878 and would continue to do so until 916.
Northumbria
The ruler of Northumbria was King Ealdræd I, who had ruled since 913 and would continue to do so until 933.
Strathclyde
The ruler of Strathclyde during this time was either King Dyfnwal or King Owain map Dyfnwal, the exact year of the succession is unknown.
Wessex
The ruler of Wessex was King Eadweard I (Edward the Elder), who had ruled since 899 and would continue to do so until 924.