From “Herefordshire Register of Countryside Treasures” (1981 H&WCC):
Walterstone Camp and Chapel Site
Circular hill fort of Iron-age. Occupies 17 ha. (4.25 acres) on NW side of Monnow Valley.
3 impressive ramparts covered with woodland and the interior is a neglected garden. Entrances at NE and SW cutting through the ramparts.
Location
1/2 mile E of St. Mary’s Parish Church at the end of spur: public footpath along north side.
Adjacent is the site of a chapel supposed to have been dedicated to St Ailsworth.