Mathern Palace is a Grade I listed building in the village of Mathern, Monmouthshire, Wales, located some south-west of Chepstow close to the Severn estuary. Between about 1408 and 1705 it was the main residence of the Bishops of Llandaff. After falling into ruination, it was restored and its gardens laid out between 1894 and 1899 by the architectural writer Henry Avray Tipping. In recent years it has been in private hands, and used as a residential centre.HistoryAccording to the Liber Landavensis, lands at Mathern and for several miles around, as far east as the River Wye, were given to the Bishops of Llandaff by Meurig, in memory of his father Tewdrig, king of Gwent and Glywysing. Tewdrig had been wounded in a battle with the Saxons near Tintern, perhaps around the year 630, and died at Mathern; the parish church of St. Tewdric was built on the spot. The bishop's residence was built nearby. It is thought that the location – some east of Llandaff – was chosen partly because its proximity to a well-used crossing point of the Severn estuary, and after their construction the castles at Caldicot and Chepstow gave protection against attacks from the Welsh.