I agree with Davye comments. I played RTRPE 1.5 and now 1.6 and have found the diplomacy extremely frustrating. I am playing the Ptolemics and started out at war with the Greeks, Macedon and the Seleucids. I offered them ceasefires early on and was refused. After about 5 years the Greeks and Macedon offered me a ceasefire, not because of what I'd been doing but because of their squabbles. I got an offer from the Seleucids after taking several of their cities; I accepted but they attacked again almost immediately. I 've also denied subsequent ceasefire requests. In summary, it appears that any offers for creasefires have to originate with the other factions; they just don't pay attention to your offers. As far as you getting a faction to become a Protectorate, forget it! I've had it happen ONCE in about 10 different games!