Hi,
I'm not very good at framing these thoughts well but here is a question for the list. I have scanned the archives but didn't find this mentioned.
Catherine/Katherine the patroness of the guild is represented by a maid who is decapitated every year.
There are theories as to her relation to Severian; most notably because of the quote where her face is described as like a reflection in a
pool of water by moonlight [paraphrased].
So, two data points:
* associated with moon
* decapitated ritually
Also, the action on Urth is mostly set around the commonwealth which is in some sense South America (and other areas)
So, further data point:
* South American influence
Finally, Severian is a solar deity and so one would expect any sisters or his mother to have a connection to the sun
* relation to sun god
So how about this: http://atheism.about.com/od/aztecgodsgoddesses/p/Coyolxauhqui.htm
She is:
* Aztec (OK, this is Mexico I know but it is close to the region)
* Goddess of the Moon
* Sister of the Sun
* Was ritually decapitated in mythology and source of inspiration for ritual decapitations in the Aztec religion.
Think she could be an inspiration for Wolfe?