Identified through the Strata Florida Landscape Project and the Cadw-funded Wetland Margins Survey, Capel y Groes was thought to be the site of a medieval chapel linked to the monastic grange of Mefenydd. In 2010, Dyfed Archaeological Trust and the University of Wales Trinity Saint David carried out geophysical survey and evaluation excavation. The survey revealed extensive archaeological features, including enclosures, boundaries, and a possible trackway. Excavation uncovered the remains of a mortared stone and timber building, dating mainly to the late 18th and 19th centuries, interpreted as a domestic structure with agri-industrial activity. While no medieval chapel was found in the trench, evidence of earlier features, including a pit and undated ditch, suggests further potential in the surrounding area.
