Map Reference SS97SW
Grid Reference SS91137483
Unitary (Local) Authority The Vale of Glamorgan
Old County Glamorgan
Community St Brides Major (The Vale of Glamorgan)
Type of Site FORTIFIED HOUSE
Broad Class Domestic
Site Description The large scale O.S. maps mark the site of `Oldcastle-upon-Alun' in a small field on the N. side of the farm of that name. The name, correctly Oldcastle-upon-Alun, has been extant in the vicinity since the mid-12th century, surviving unchanged for Oldcastle Down, the high ground N.W. of the site.
The re-use of medieval dressings in the immediate vicinity increases the credibility of a castle or strong house here. These dressings relate to two doorways, respectively of 13th- and 15th-century character.