Sisillius I
Sisillius I (Welsh: Seisyll) was a legendary king of the Britons as accounted by Geoffrey of Monmouth. He came to power in 753 BC.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
He was preceded by Gurgustius and succeeded by Jago. He was the father of Kimarcus, who became king of the Britons after Jago, and shares his name with one of the sons of Ebraucus, and two later kings of the same name (Sisillius II and Sisillius III).<ref>Tree: Seisyll (Sisillius I) (King) in BRITAIN</ref> Geoffrey has nothing to say of him beyond this.<ref name = "geoff">Geoffrey of Monmouth: The History of the Kings of Britain : an Edition and Translation of De Gestis Britonum (Historia Regum Britanniae), Boydell & Brewer, 1 Jan 2007, p.44.</ref>
Relation to Jago
In the {{#invoke:Lang|lang}}, Sisillius is succeeded by Jago, who the Latin text describes as "{{#invoke:Lang|lang}}". This is generally interpreted as meaning "Jago, Gurgustius's nephew", but could mean "Jago, Gurgustius's grandson" instead.<ref name="Guy 2020">Template:Cite book</ref>
As a result, most later sources assume that Jago was Sisillius' cousin, but the Black Book of Basingwerk, following the latter interpretation, called Jago the son of Sisillius (and so grandson of Gurgustius through Sisillius).<ref name="Guy 2020"/>
Template:House of Brutus family tree
Notes
<references/>
Template:S-start Template:S-reg Template:S-bef Template:S-ttl Template:S-aft Template:S-end