- You may be looking for the Cunovellasus from The Legions of Death.
Cunovellasus was a druid.
One night, as he left the clan to prepare for the winter solstice, he was followed by Calagundus who was curious about the ritual. At the ruined temple, they encountered the Fourth Doctor and Leela, who helped them scare off the shadow-men who were approaching.
Afterwards, Cunovellasus allowed the Doctor and Leela to join them for their clan's festivities. (PROSE: The Prodigal Sun [+]Matthew Griffiths, Short Trips: The History of Christmas (Short Trips short stories, 2005).)
Behind the scenes[]
Calagundus and Cunovellasus, the two named Britons in The Prodigal Sun [+]Matthew Griffiths, Short Trips: The History of Christmas (Short Trips short stories, 2005)., share their names with two characters in The Legions of Death [+]J. Andrew Keith, The Doctor Who Role Playing Game (FASA, 1986)., an earlier Doctor Who story also set around the Roman conquest of Britain. However, they do not appear to be intended to come across as the same characters, as the Legions of Death characters were chieftains of distinct tribes, and only two years apart in age. The reuse of the names may simply be intended to add a consistent texture to the DWU's depiction of Britonic culture.