saidith

English Middle (ca.1100-1500) to English Law/Patents Law (general)

Did "saidith" ever exist as a past tense of "to say"?

I'm trying to determine if an author has invented a quote out of whole cloth, or if a quote in a manuscript containing this word could actually be a real quote. The quote (which I'd rather not put in full due to Google) is supposed to be from a legal document from mid-17th-century New England. I know the 1650s are not exactly the time period of this source language field, but this is a question for specialists, who will read the Middle English questions.

All other uses of the past tense of "to say" in this document (the author has, if my hunch is right, basically added an imaginary few sentences to the end of what is a real document) are plain ol' "said," not "saidith," and a search in books.google.com shows, when I look at them, NO uses of "saidith." Something that shows up after a search, from a book from 1740, is actually "said o' th'" when you click the link. Searches on Google proper of "saidith" basically reveal modern people playing with language.

Long intro, I know, but I'm fascinated to know if my suspicions are accurate or not. Thank you so much.