OK here is my theorie... the first cleu is mentioning machiavelli, also i think he is going to be good because mars said that he didn't know what machiavelli wanted because he (machiavelli) didn't know it himself... and if he (and maybe is elder, what means that is elder can be good two, even in historie.) is becoming good, that means that he (and maybe is elder) has lied the whole time.
second I go for Ra, because in the dutch version, witch I readed, i thinked it wasn't ruling like a king, but more like being the head god, witch was Ra.
third i go for that victoria girl, because some of you said mach and elder already had mentioned her killing her elder (I can't remember reading that)
forth, I'll go for........... I don't know, the last biggest warrior, but for now I think that's Jeanne d'Arc, and that would not being like "meeting somebody new, I know yet
I don't think that Abraham is Dee's master, because why would he give away the Codex if he is stil alive? why would he point out protectors of the codex, to protect it from himself? it is posible, but than I think he would have a splitted personality, than he would realy protect the Codex from himself