Parchmarks at Tyn-Llan-Uchaf show part of a bivallate, rectangular enclosure enclosing spur, now largely built over by St Deiniolen's church and grave yard. Two ditches are visible at west end of spur, with one straight side and rounded corners at the north-west angle. Dimensions possibly up to 150m SW/NE by 70m NW/SE. It is possibly a Roman military site. Discovered during RCAHMW aerial reconnaissance, 15 July 2003.

T Driver