it is a pity that the Photian Council did not vote some other canons of a more practical and useful nature, as this would have secured it a prominent place in the canonical legislation of the Western Middle Ages and made it difficult for the ‘Photian Legend’ ever to see the light.
Dvornik identifies the structural canonical vacuum that permitted the Photian Legend to emerge, arguing that the Photian Council’s limited canonical legacy left it vulnerable to oblivion and misrepresentation in the Western tradition.
, The Photian Schism: History and Legend, 1948thesis