I'm writing a novel set in ancient Egypt, and I need to think of what to call the type of slave who would travel with the army and look after the general physical wellbeing of the officers, i.e. washing and bathing them, giving massages and treating minor injuries. I guess the main one that comes to mind is body slave, but that seems a little too low down the hierarchy. The kind of slave I'm thinking of would have some kind of rudimentary medical knowledge for treating wounds etc, although is not a trained doctor. Any ideas?