Pen y Fan is the highest peak in South Wales, situated in the Brecon Beacons National Park. At 886 metres (2,907 ft) above sea-level, it is also the highest peak in Britain south of the Snowdonia mountain range. The twin summits of Pen y Fan and Corn Du were formerly referred to as Cadair Arthur or 'Arthur's Seat'

Tommy Jones was a five year old miners son who went missing in August 1900 when visiting her grandfather who lived on a farm below the peaks. The obelisk now stands close to the spot where his body was found.