It is remembered as the original home of the important collection of the Peniarth Manuscripts, now in the National Library of Wales.
[1] A new house was built in 1750–54 on the site of the earlier building; it was substantially remodelled in 1830, when it was refaced in stone.
The collection was originally assembled by the collector and antiquarian Robert Vaughan, who lived at Hengwrt during the 17th century.
In 1904 Sir John Williams purchased the collection from the Wynne family, subsequently donating it to the new National Library when it was established in 1907.
[7] In the late 19th century it was the home of sculptor Mary Lloyd and her partner, the journalist and social reformer Frances Power Cobbe.