Alba
The ruler of Alba was King Donald II (Donald the Madman), who had ruled since 889 and would continue to do so until 900.
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 Ecgberht II, who had ruled since 875 and would continue to do so until 895.
Strathclyde
The ruler of Strathclyde at this time was likely to have been King Dyfnwal.
Wessex
The ruler of Wessex was King Ælfræd (Alfred the Great), who had ruled since 871 and would continue to do so until 899.