Treowen is an early 17th-century house in Monmouthshire, Wales, regarded as "the most important gentry house in the county". It is located in open countryside within the parish of Wonastow, about ½ mile (1 km) north-east of the village of Dingestow, and 3 miles (4.8 km) south-west of Monmouth. After being used as a farmhouse for three centuries, Treowen now operates as a conference and functions venue and holds the annual Wye Valley Chamber Music Festival. It is a Grade I listed building, and its gardens are designated Grade II on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.

Llanarth Court is a late-18th-century country house with substantial 19th-century alterations in Llanarth, Monmouthshire, Wales. The court was built for the Jones family of Treowen and was subsequently the home of Ivor Herbert, 1st Baron Treowen, whose family still owns much of the Llanarth estate, although not the court itself. The court is a Grade II* listed building and is now a private hospital. The gardens are included on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.