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Dear Group! In looking at the ancestry of Sancha de Ayala there is a
Chamoa Mendez daughter of Viegas de Souza and Elvira Fernandez married
to Gomes Mendez Guedano.
My first question concerns the mother of Chamoa. What is known of this
Elvira Fernandez i.e of Toledo or de Marnel?
If of Toledo the father of Elvira may have been a Moor?
Second question concerns the ancestry of Gomes Mendez Guedano. He goes
back to a Gueda the Old Guedeao. Is the latter the son of a mozarabe
named Gomez Mendez.I have seen it stated he also had Visigothic descent?
Unfortunately, you are delving into a period in which the majority of the sources are simply traditional pedigrees or modern scholarly reconstructions (read guesswork), not fully documented with contemporary evidence. Even the link of Sancha de Ayala's documented Toledo Barroso family to the Basto-Guedoes has recently been questioned (at least in the specific details of the connection). This lack of information is further exacerbated by the internet echo chamber, where speculation, misunderstanding, error, etc. all get magnified and combined. What this means is that we are really going into the weeds with this, and it all should be taken with an ocean of salt.
Addressing your second question first, i don't have the appropriate notebook handy, but I am pretty sure the traditional pedigree of the family begins with Gueda Guedeão. That this man was son of a mozarab named Mendo Gomes with links to Toledo seems to be a more recent addition to the story, and seems highly unlikely to me. Among other things, the Mozarabs of Toledo used an entirely different pool of names, and neither Mendo nor Gomes appear in the early Toledo Mozarab records. There is always the possibility that a Mozarab who fled then-still-Muslim Toledo adopted a 'Portuguese alias' but it is more likely someone just made this up to cover over the lack of information on Gueda Guedeão. That being said, I would have to try to trace the citation tree back to see where the claim originally comes from, and I don't currently have access to the necessary sources.
As to Elvira Fernandes, the Livro de Linhagens says that she was daughter of Fernando Affonso, who was of Toledo, and his wife Orraca Goncalves, daughter of Goncalvo Vieges de Marnel. This could have provided the starting point for the claimed Marnel parentage, or it could be an attempt to render conflicting parentage by making a chimera of two versions. As to the Toledo connection, the Toledo Mozarabs did not use such names until about a century later. Fernando might have been a Castilian who took part in Toledo's capture, but it is unlikely he was a Mozarab, and even less likely he was a Moor (at least not based simply on him being supposedly from Toledo). Again, ocean of salt - this whole body of early Portuguese genealogy is sketchy, at best, but we lack any real sources on which to even evaluate it.
I have the following from a post by Nat Taylor in 2014. I will quote:
Elvira Fernandez is a daughter of a Fernando Alfonso de Toledo who was a moor and the king Dom Alfonso made him Christian because he was an honored man and of great company and was his godfather and married him to Urraca Gonzalez dau of Gonzalo Viegas de Marnel. (LL 22 D.8,43.B.3)
An Elvira Fernandez or a Teresa Fernandez de Marnal daughter of a Fernando Marnal is listed in Portugese Genealogies as being married to Viegas de Sousa with the latter as being the mother of Chamoa.