Ruler · 820 – 878

Rhodri Mawr

Lived 820 – 878; monarch. King of Gwynedd of Kingdom of Gwynedd, 844 – 878; also in the line of Kingdom of Powys.

For the full story, the article on Wikipedia (CC BY-SA 4.0); this page holds what the record says of the reign.

Lived: 820 – 878; 58 years
In office: 34 years; one reign
Lines: 2; states
Left it: died in office; read off the dates alone

King of Gwynedd

Kingdom of Gwynedd · the 18th of 40 dated reigns · 450 – 1240

14 before

Cynan Dindaethwy798 – 816

Hywel ap Rhodri Molwynog816 – 825

Merfyn Frych825 – 844

Rhodri Mawr844 – 878

Anarawd ap Rhodri878 – 916

Idwal Foel916 – 942

Hywel Dda942 – 950

19 after

killed, executed or dead in battledied in officeleft alive by a regular roadending not on recorda second row: a reign that began before the last had ended — rival claimants, or a shared thronethis entry

Reigned 844 – 878 · 34 years · came to it aged 24

Came to it: the child of the ruler before, on record
Left it: died in officeread off the dates alone: the term ends in 878, the year they died

Also in the line of Kingdom of Powys (1st of 4).

Open in the atlas

Rhodri Mawr in the atlas: the article, every line they sat in, and the map in their years.
Analyse the succession of Kingdom of Gwynedd: every reign, how each ended, and the numbers over them.
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Wikidata Q470862 (CC0) · the reigns from Wikidata's P39 terms, the rulers' own articles read by grammar (sentences quoted above, CC BY-SA 4.0) and Kokkonen & Sundell where they code the line · data built 2026-10-06 · Pastlas v2.9.1, by Oleh Voronko. The published atlas and its data are for non-commercial use.