Causantín mac Cináeda
Scottish king
Causantín mac Cináeda (Modern Gaelic: Còiseam mac Choinnich; c. 836 – 877) was King of the Picts from 862 until his death in 877. He is often known as Constantine I in reference to his place in modern lists of Scottish monarchs, but contemporary sources described Causantín only as a Pictish king. A son of Cináed mac Ailpín ("Kenneth MacAlpin"), he succeeded his uncle Domnall mac Ailpín as Pictish king following the latter's death on 13 April 862. The reign of Causantín likely saw increased activity by Vikings, based in Ireland, Northumbria and northern Britain. He died fighting one such invasion.
Sources
Very few records of 9th-century events in northern Britain survive. The main local source from the period is the Chronicle of the Kings of Alba, a list of kings from Cináed mac Ailpín (died 858) to Cináed mac Maíl Coluim (died 995). The list survives in the Poppleton Manuscript, a 13th-century compilation. Originally simply a list of kings with reign lengths, the other details contained in the Poppleton Manuscript version were added from the tenth century onwards.
“Causantín mac Cináeda” enters the record as scottish king. Crown Archives preserves that source wording while asking what Causantín, Cináeda and Scottish can confirm, complicate or overturn.
Why this record matters
“Causantín mac Cináeda” is worth following because a concise public description often conceals a longer documentary argument. Here, Causantín, Cináeda and Scottish provides the most credible route into that argument.
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 May 10, 2026. The linked authority identifier is Q317457. VIAF identifies the subject as 172788691. 2 of 2 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank.
Later biographies can compress uncertainty and repeat inherited reputations, so apparently settled claims may still require comparison. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. 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 “Causantín mac Cináeda”, its source revision and the description used here.
- Expand the search: follow Causantín mac Cináeda primary sources, Causantín mac Cináeda archive and Causantín 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 “Causantín mac Cináeda”?
- Which claims depend on a single source or contested interpretation?
- How has the subject’s reputation changed across later accounts?
Search terms from this dossier
This entry incorporates text from “Causantín mac Cináeda” 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.