One of King Arthur's ‘Three Tribal Thrones of the Island of Britain’, according to the Welsh Triads. It is the only one in Cornwall; the others are St David's in Wales and Pen Rhionydd in Scotland. Although it is often cited in Cornish tradition, Kelliwic's precise location is not known. Most likely candidates are Castle Killibury or Kelly Rounds, an Iron Age hill-fort near Wadebridge, which was also occupied in post-Roman times; another is the town of Callington.
See Rachel Bromwich, Trioedd Ynys Prydain, rev. edn. (Cardiff, 1978), pp. lxxiiiff.;Geoffrey Ashe, A Guidebook to Arthurian Britain (London, 1980);Rachel Bromwich et al. (eds.), The Arthur of the Welsh (Cardiff, 1991), 234–8.