Dedicated to St Giles (St Mabon), Gileston Church also takes its name from the Giles family who held the manor in 1350. The present church, a Grade 2* Listed Building, dates from the 15th century, although it is thought that an earlier church existed on the same site.
The south door, dating to the mid 15th century, has six carved shields, and retains its original hinges. The shields show the
heraldic arms of local families - the Walshes of Llandough, the Umfravilles of Penmark, (1104-1350), the Giles family, the Giles of Gileston of 1262, the Fleming family and the Cradock family. The date of the door itself is probably 1450 -1480.
Source: The Rectorial Benefice of Llantwit Major [Accessed 13th December 2011].
L. Moore, RCAHMW, 13th December 2011