Triad credits

Three Exalted Prisoners of the Island of Britain:
Llyr Half-Speech, who was imprisoned by Euroswydd, and the second, Mabon son of Modron, and third, Gwair son of Geirioedd. And one (Prisoner), who was more exalted than the three of them, was three nights in prison in Caer Oeth and Anoeth, and three nights imprisoned by Gwen Pendragon, and three nights in an enchanted prison under the Stone of Echymeint. This Exalted Prisoner was Arthur. And it was the same lad who released him from each of these three prisons- Goreu, son of Custennin, his cousin.

Three Frivolous Bards of the Island of Britain:
Arthur, and Cadwallawn son of Cadfan, and Rahawd son of Morgant.

Three Fortunate Concealments of the Island of Britain:
The Head of Bran the Blessed, son of Llyr, which was concealed in the White Hill in London, with its face towards France. And as long as it was in the position in which it was put there, no Saxon Oppression would ever come to this Island; The second Fortunate Concealment: The Dragons in Dinas Emrys, which Lludd son of Beli concealed; And the third: the Bones of Gwerthefyr the Blessed, in the Chief Ports of this Island. And as long as they remained in that concealment, no Saxon Oppression would ever come to this Island.  And they were the Three Unfortunate Disclosures when these were disclosed. And Gwrtheyrn the Thin disclosed the bones of Gwerthefyr the Blessed for the love of a woman. That was Ronnwen the pagan woman; And it was he who disclosed the Dragons; And Arthur disclosed the Head of Bran the Blessed from the White Hill, because it did not seem right to him that this Island should be defended by the strength of anyone, but by his own.

Three Unrestrained Ravagings of the Island of Britain:
The first of them when Medrawd came to Arthur's Court at Celliwig in Cornwall; he left neither food nor drink in the court that he did not consume. And he dragged Gwenhwyfar from her royal chair, and then he struck a blow upon her; The second Unrestrained Ravaging when Arthur came to Medrawd's court. He left neither food nor drink in the court;  And the third Unrestrained Ravaging when Aeddan the Wily came to the court of Rhydderch the Generous at Alclud [Dumbarton]; he left neither food nor drink nor beast alive.

Welsh Triads