[To his luck, at this point she has already met Arthur, so while she's surprised, it is more of the fact that the one who looks like Aramis would be one of the best knights... But then again, there is the whole Guinevere thing and Aramis always runs after the ladies (though not the queen, at least OR SO SHE THINKS), so maybe it makes sense.]
Lancelot? Really? I believe I met your king, earlier.