Trelleck Grange (or Trellech Grange) is a small hamlet in a rural area of Monmouthshire, south east Wales, United Kingdom. It is located about 3 miles south of Trellech, 2 miles west of Tintern, and 7 miles south of Monmouth, the county town. It sits on high ground above the Wye Valley AONB and Tintern Abbey, between two tributaries of the Angiddy Brook.
The area was once part of the manor of Trellech, with a church known as Ecclesia Mainuon, but in 1138 it was granted to the monks of the then newly established Tintern Abbey by Gilbert de Clare, the lord of Striguil or Chepstow. The monks then cultivated it as a grange, making it the principal farm for food production for the Abbey.[1]
A small parish church, with no known dedication, still exists, surrounded by farm buildings. It was largely rebuilt on the original foundations in 1861.[1]