The Nuttall Encyclopedia
A small old town in Monmouthshire, on the Usk, 2½ m. NE. of Newport; celebrated by Tennyson in connection with Arthurian legend; it is a very ancient place, and contains relics of Roman times.
Wood, James, ed. Entry for 'Caer`leon'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/c/caerleon.html. Frederick Warne & Co Ltd. London. 1900.