The standing stone at Pen-yr-Orsedd is a tall and slender erect monolith 5.1m high by 1.7m wide and 0.8m thick. This may be a prehistoric monument of some kind, possibly a Bronze Age ritual stone, although a more recent date and mundane function are also possible. A second similar stone stands some 230m to the south (NPRN 302308).

Source: RCAHM Anglesey Inventory (1937), 109

John Wiles 30.08.07