Rǫgnvaldr Guðrøðarson
King of the Isles
Rǫgnvaldr Guðrøðarson (died 14 February 1229) ruled as King of the Isles from 1187 to 1226. He was the eldest son of Guðrøðr Óláfsson, King of Dublin and the Isles. Although the latter may have intended for his younger son, Óláfr, to succeed to the kingship, the Islesmen chose Rǫgnvaldr, who was likely Óláfr's half-brother. Rǫgnvaldr went on to rule the Kingdom of the Isles for almost forty years before losing control to Óláfr.
The Crovan dynasty may have reached its zenith during Rǫgnvaldr's reign. Acclaimed in one near contemporary Scandinavian source as "the greatest warrior in the western lands", he lent military aid to William I, King of Scotland against the disaffected Haraldr Maddaðarson, Earl of Orkney and Caithness, and occupied Caithness for a short period of time at about the turn of the thirteenth century. Like his predecessors, Rǫgnvaldr was closely associated with the rulers of northern Wales. A daughter of his was betrothed to Rhodri ab Owain, a dynast of the ruling family of Gwynedd. In 1193, Rǫgnvaldr lent military aid to Rhodri against his rivals. Rǫgnvaldr was also involved in Irish affairs, as he was the brother-in-law of John de Courcy, one of the most powerful of the incoming Englishmen.
This brief starts where responsible research should: with the source description of “Rǫgnvaldr Guðrøðarson” as king of the Isles. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the people & ideas register because the source frames it as king of the Isles. Its deeper value depends on whether names, dates, institutions and citations support that framing.
The entry’s evidential value lies in the named roles, institutions and publications that can be tested against primary documentation. The source revision retrieved here is dated Jul 26, 2026. The linked authority identifier is Q2087519. VIAF identifies the subject as 24069558. The Library of Congress control number is n2008029882. 3 of 3 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1229, 1187, 1226 and 1193.
A concise life account rarely captures disputed attribution, private networks or the changing language used to describe a career. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Read biographical claims against dates, named institutions and the cited references. Distinguish a subject’s later reputation from evidence produced during their lifetime.
- Establishing names and roles
- Building a first chronology
- Locating cited institutions
Personal papers, civil or court records, institutional files and the scholarship cited by the source.
Three-step research path
- Establish the record: confirm the title “Rǫgnvaldr Guðrøðarson”, its source revision and the description used here.
- Expand the search: follow Rǫgnvaldr Guðrøðarson primary sources, Rǫgnvaldr Guðrøðarson archive and Rǫgnvaldr research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Rǫgnvaldr Guðrøðarson”?
- Which claims depend on a single source or contested interpretation?
- Which primary records establish identity, chronology and institutional ties?
Search terms from this dossier
This entry incorporates text from “Rǫgnvaldr Guðrøðarson” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.