AlbaAlba had many competing rulers in 878:
- King Áed
- King Giric (Son of Fortune)
- King Eochaid
The ruler of Gwynedd was King Anarawd ap Rhodri.
The ruler of Mercia was King Ceolwulf II, who had ruled since 874 and would continue to do so until 883.
The ruler of Northumbria was King Ecgberht II, who had ruled since 875 and would continue to do so until 895.
The ruler of Strathclyde at this time was likely to have been King Dyfnwal.
The ruler of Wessex was King Ælfræd (Alfred the Great), who had ruled since 871 and would continue to do so until 899.