sentences:  The castle was attacked and destroyed by the forces of Owain Glyndŵr in 1402 during his rebellion.Whilst there is a romantic story associating the castle location with the marriage of Guinevere and King Arthur, this probably developed from an earlier story, which suggested that a marriage took place between Gwenhwyfar, the daughter of Ogrfan Gawr (also called 'Gogrfan Gawr "the Giant" of Castell y Cnwclas' – Knucklas Castle), and Arthur the warrior – there being no reference to Arthur as a king in the early Welsh texts.The spectacular 13-arch span was completed by the Central Wales Railway in 1865 and recorded in an engraving from the Illustrated London News.