Valle Crucis is rather light on myths involving the Abbey itself. Individuals, such as St Collen were said to live close by, and so their adventures can be said to be attributable by association. Those tales are told elsewhere in these pages.
However, it is said that soon after Owain Glyndwr's disappearance after the failure of his uprising between 1400-1410, the abbot of Valle Crucis was out walking early one morning.
In the grounds of the Abbey he met a horseman, making his way through the mist. On meeting, the horseman pulled up.
'You're out early, this morning, abbot.' said the horseman.
The abbot, on recognising the man as the great Glyndwr, Prince of Wales, replied, 'No, my lord, Owain, it is you who are early - one hundred years too early.'
With that, the horseman rode on, never to be seen again.
It is said that this was a prophecy, a vision of the rise of the Tudor Dynasty that came to power under the Welsh born Henry Tudor, on the field of Bosworth in 1485. It is claimed that Owain Glyndwr was the ancestor of Henry VII whose family suffered for their allegiance to Glyndwr in the Welsh Uprising.