Novels by author Takeuchi Ken

Harem Dynast is the story of a princess set up in a political marriage with King Lorent, a great conqueror who is often mentioned in the Harem novels.

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world. It's about a swordswoman whose student is captured, so she goes to rescue her.