No but genuinely 😅

Roosevelt's "On the Ancient Irish Sagas" is available on HathiTrust

Curiously, Hywel Fychan’s spelling of Uchtryt with an internal ’t’ differs both from the White Book and his own copy of the text in the Red Book. Though other instances of the name in the Red Book are spelled similarly, this seems to confirm that he didn't copy the name from either manuscript.

The latter possibility seems more likely. Notably, Hywel Fychan added the name Uchtryt to the end of his entry in the White Book to show that this is who follows Gwefl in Arthur's court list. And it is indeed with Uchdryt that the White Book text picks back up after the remaining gap.

Another interesting part of this is that minor orthographic differences show that when Hywel Fychan added the description of Gwefl to the White Book, he was not copying from the Red Book text. Was he copying from memory, or from another - now lost - exemplar?

Defnyddiol iawn! Diolch!

Hywel Fychan therefore had access to the White Book, though he made no other contributions to it. Perhaps he too was a fan of Gwefl son of Gwastad?

In the earlier White Book, an unusual gap spanning two columns was left in the tale of Culhwch & Olwen. There’s no obvious cause for this gap and comparison with the Red Book text suggests it's bigger than was necessary. Indeed, all that seems to be missing is Gwefl - and Hywel Fychan filled him in!

These two medieval Welsh anthologies contain many of the same texts, though the one was not the exemplar of the other. Yet Gwefl shows us that one Red Book scribe, Hywel Fychan, did at one point have access to White Book.