Similarities are sometimes peripheral, such as that both Bran the Blessed and the Grail keeper the Fisher King receive wounds in their legs and both dwell in a castle of delights where no time seems to pass.
•
Whereas early 20th-century Celtic enthusiast Jessie Weston unequivocally declared that an earlier form of the Grail narrative could be found in Preiddeu Annwfn, modern researcher Richard Barber denies Celtic myth had much influence on the legend's development at all.
•
Arthur's warrior Llenlleawc the Irishman grabs Caladvwch (Excalibur) and swings it around, killing Diwrnach's entire retinue.
Cader Sedat, the island where the renegade mage Metran works his dark magic in The Wandering Fire, is the analogue of Caer Sidi from the poem Preiddeu Annwfn, a poem that is, in the trilogy, ascribed to Taliesin, one of the names used by Flidais.