Maen Huail is a stone block at St Peter's Square, in the centre of Ruthin, Denbighshire, North Wales. A circular plaque next to it states "Maen Huail on which tradition states, King Arthur beheaded Huail, brother of Gildas the historian". The stone was recorded in 1699 as being in the middle of the road, and now stands on a concrete plinth against the half-timbered wall of the Barclays Bank building, a 20th-century copy of the now mainly destroyed Exmewe Hall.. Cadw SAM: DE030: Maen Huail Historic Stone

The legend probably originated as an oral tradition, and is first recorded in the Chronicle of Six Ages of the World by Elis Gruffydd, dating to around 1550.'The Quarrel of Arthur and Huail, and the Death of Huail ap Caw', in The Chronicle of Elis Gruffudd. Celtic Literature Collective. Accessed 14 April 2016 The stone itself is thought more likely to be a market or civic stone, or a preaching stone. It is a craggy and heavily weathered limestone boulder, measuring long, and some high and wide.

See also List of individual rocks List of Scheduled Monuments in Denbighshire

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