Gurgustius was a legendary king of the Britons as accounted by Geoffrey of Monmouth. Geoffrey of Monmouth ( Gruffudd ap Arthur or Sieffre o Fynwy) (c He was the son of King Rivallo and was succeeded by Sisillius I. Rivallo ( Welsh: Rhiwallon) was a legendary king of the Britons as accounted by Geoffrey of Monmouth. Sisillius I ( Welsh: Seisyll) was a legendary king of the Britons as accounted by Geoffrey of Monmouth.
| Preceded by Rivallo |
Mythical British Kings | Succeeded by Sisillius I |