Oxwich Castle occupies a position on a wooded headland overlooking Oxwich Bay on the Gower Peninsula, Wales, United Kingdom (Google view).

Transcripted text from the plate by Oxwish Castle:

Oxwich Castle was built in the sixteenth century, probably on the site of an earlier building. It was erected by the Mansel family, who occupied a leading position among the Tudor gentry of Glamorgan.
With its courtyard plan and semi-fortified design, including this impressive, mock-military gateway, Oxwich recalls several other manor houses in south Wales designed for a powerful gentry class whose life-style resembled that of earlier feudal magnates.
Oxwich castle comprises two adjacent ranges of buildings. The smaller south range to your left is the earlier, built by Sir Rice Mansel (whose initials appear on the decorative plaque over the outer gateway). On an altogether larger scale, the east range behind you is the roof less shell of a "great house", probably built by Sir Rice's son, Sir Edward Mansel.

Sir Rice Mansel
Welsh Biography Online - Mansel Family

I took some pictures at this site in 2008, if anyone is interested in a copy.