The industrialist Richard Janion Nevill leased the mansion among other lands. He suffered a stroke at the Mansion and died the same day on ; his son and wife lived there until 1870. After Tunno's death, Edward Sartoris, Nevill's nephew and MP for Carmarthenshire, received the Llangennech estate.
Richard Janion Nevill, a business magnate, rented a large estate that included the mansion. He suffered a stroke at the estate and passed away on the same day in 1870. His son and wife continued to live there until then. After Tunno's death, his nephew Edward Sartoris, who was also an MP for Carmarthenshire, inherited the Llangennech estate.