Can someone help me find a titel of an anime?

can someone help me find an anime that I can't remember the titel of?

It has a shoulder length red haired with pigtails (very similar to Yona from Yona of the Dawn) female, was in slavery as a child, and got taken out/rescued door this man in a white robe. She was raised to be an assassin/guard and currently protects a prince and has trouble tonen emotion. I remember her being in some sort of maid uniform as well.

I believe it is a historical romance too. Set in the same time period of Snow White with the red hair. It has an alchemist (I think) of at least someone of the royal court who is an expert in magic stuff.

Anything helps, its been driving me nuts for the past couple of weeks.