Tredegar House is generally believed to have been designed by Inigo Jones, but it was not built until after that architect's death. It was built by William Morgan, and finished about 1672. A residence formerly stood on the spot, which Leland mentioned as "a fair place of stone." Owen Glendower, when he ravaged Wentloog, and destroyed houses, churches and Newport Castle, probably destroyed Tredegar House. On an inquisition being taken after this period of the value of the lordship, the return was nil.

Cambrian Association Meeting,
August 28th, 1885.