Aha. There were two, Sima Babovich (http://en.wikipedia.org/wiki/Sima_Babovich) and Abraham Firkovich (http://en.wikipedia.org/wiki/Avraham_Firkovich).
----- Original Message ---- The main Karaim guy making the argument, I don't remember his name but you can Wiki it, apparently went so far as to forge documents to "prove" it.