During the early nineteenth century, the Crown and Thistle Inn briefly housed one of the earliest Masonic Lodges in Monmouthshire.

The Crown and Thistle Inn, a public house in Monmouth, was located on the north side of Agincourt Square, near the site of a previous bull ring.

Author Charles Heath indicated that it had been the custom to tie a bull to the ring, and that previous Monmouth residents had availed themselves of a "cruel diversion.

[2] In the mid-nineteenth century, Pigot's Directory of 1844, under the listing of "Taverns & Public Houses," indicated that the proprietor of the Crown and Thistle in Agincourt Square was Charles Edwards.

[5] In his 1804 account of the history of Monmouth, Heath offered his opinion that a visitor to the town would find no better establishment in which to partake of refreshments than the Crown and Thistle Inn, with particular regard to its garden in the summer.

He painted a charming picture of the public house's garden, recommending it for its proximity to the sounds of the River Monnow, and its view of the local landscape.

The early nineteenth-century, black and white engraving is entitled "The Town Hall & principal street in Monmouth, from the Crown & Thistle Inn."

The door to the room in the upper level of the Crown and Thistle Inn that was utilized for early lodge meetings was embellished with Masonic symbols that were still visible in the 1920s.