Sisillius I

Sisillius I (Welsh: Seisyll) was a legendary king of the Britons as accounted by Geoffrey of Monmouth. He was preceded by Gurgustius and succeeded by Jago. He was the father of Kimarcus, king of the Britons.[1]

Family tree of the House of Brutus

See also: List of legendary kings of Britain
 
 
Corineus
 
 
 
 
 
Brutus of Britain
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Queen Gwendolen
 
Locrinus
 
Albanactus
 
Kamber
 
 
 
 
 
 
 
 
 
 
 
 
 
Maddan
 
 
 
 
 
 
 
 
 
 
 
Mempricius
 
 
 
 
 
 
 
 
 
 
 
Ebraucus
 
 
 
 
 
 
 
 
 
 
 
Brutus Greenshield
 
 
 
 
 
 
 
 
 
 
 
Leil
 
 
 
 
 
 
 
 
 
 
 
Rud Hud Hudibras
 
 
 
 
 
 
 
 
 
 
 
Bladud
 
 
 
 
 
 
 
 
 
 
 
King Leir
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Goneril
 
Regan
 
Cordelia
 
 
 
 
 
 
 
 
Marganus
 
Cunedagius
 
 
 
 
 
 
 
 
 
 
 
Rivallo
 
 
 
 
 
 
 
 
 
 
 
Gurgustius
 
 
 
 
 
 
 
 
 
 
 
Sisillius I
 
 
 
 
 
 
 
 
 
 
 
Kimarcus
 
 
 
 
 
 
 
 
 
 
 
Gorboduc
 
Judon
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Ferrex
 
Porrex I

Notes

  1. ^ Tree: Seisyll (Sisillius I) (King) in BRITAIN
Preceded by
Gurgustius
'Mythical British Kings' Succeeded by
Jago