I was reading Basara and really enjoyed it. Now, it doesn't have to be historical, but as long as the male and female lead are on opposing sides and they fall for each other with people on their sides trying to stop it.

You may want to look at Superior, and it's sequel Superior † if you haven't read them already.

Quote from Geese1

You may want to look at Superior, and it's sequel Superior † if you haven't read them already.

I have, it was really good.