[2][3] Archaeologists at Gwynedd Archaeological Trust consider it to have been a royal home and have established an exhibition in the Pritchard-Jones Institute in the village on their findings supporting this theory.

[4] A fierce sandstorm in the winter of 1332 buried the site and much of the surrounding area, which may have caused the decline in activity during the 14th century revealed by the archaeological investigation.

Many artifacts were recovered from the site, including pottery and silverware indicating use by people of a high social status, as well as lead fishing weights.

[8] A reconstruction of the Great Hall of Llys Rhosyr was built as part of the redevelopment of St Fagan's National History Museum, Cardiff, using a grant from the Heritage Lottery Fund awarded in 2012.

[2] The building was opened to the public in October 2018 and the first group of visitors to spend the night were children and teachers from Ysgol Santes Dwynwen School in Newborough, Anglesey, in May 2019.