Waldo (Goronwy) Williams (30 September 1904 – 20 May 1971) was one of the leading Welsh-language poets of the 20th century. He was also a notable Christian pacifist, anti-war campaigner, and Welsh nationalist.
A commemorative stone seen in photo was erected to celebrate the life and work of the poet and comprises of a bluestone monlith with a polished black granite plaque on its northern side and is located in Carreg Waldo in the Preseli Hills.
