Named in the Mabinogion story of Culhwch and Olwen as the chief leader of Cornwall and father of Arthur’s warrior Gormant.
Welsh tradition seems to equate Rica with Gorlois, or at least with the latter’s traditional role, as he is the “chief elder of Cornwall” and first husband of Eigyr (Igraine).
Source
Culhwch and Olwen | Late 11th century