Note 27 — Chapter IX · Place-name Stories
Reading edition
Cas Ỻychwr, ‘Loughor Castle,’ is supposed to involve in its Ỻychwr, Ỻwchwr, or Loughor, the name of the place in the Antoninus Itinerary, 484, 1, to wit Leucarum; but the guttural spirant ch between vowels in Ỻychwr argues a phonetic process which was Goidelic rather than Brythonic. ↑