Catellus (Welsh: Kadell map Geraint) was a legendary king of the Britons, as recounted in Geoffrey of Monmouth's work Historia Regum Britanniae. According to Geoffrey he was the son of King Gerennus and was succeeded by his son Millus. In some versions of the Brut y Brenhinedd, a series of Welsh versions of Geoffrey's Historia, Catellus is succeeded by his son Coel, who is then succeeded by his own son Porrex II.
| Preceded by Gerennus |
Mythical British Kings | Succeeded by Millus |