[1][4] Lady Llangatock, née Georgiana Marcia Maclean, was the wife of John Allan Rolls, 1st Baron Llangattock (1837–1912).

Lord and Lady Llangattock were the parents of four children, including their youngest son Charles Stewart Rolls (1877–1910).

[7][9] The Nelson Museum was established at the former Monmouth Gymnasium in 1924 and the collection amassed by Lady Llangattock formed the core of its offerings.

In addition to the admiral's relics, the Monmouth Museum's collection includes information about Lady Llangattock's famed son Charles Stewart Rolls.

[2][12] During the interval since the move of the museum, the building served for a time as an auction venue, and more recently has been converted to residential apartments.

In February 2006, an application was submitted to the Monmouthshire County Council, requesting permission to convert the listed building to three flats; approval was granted the following August.

[16][17] In April 2008, another application was submitted to the Monmouthshire County Council, requesting that further renovation of the Glendower Street building be permitted for its continued use as apartments; the modifications were approved the following June.

[1] The Agincourt Street facade features a canted bay and another window with castellated parapet and apron.