Crown & Court Series by Sherwood SmithRead about the other entries on the list.
I have recently been led to understand that the world in Sherwood Smith’s brilliant duology is supposed to be ours, set far in the future on a distant planet, where the magic is alien science. This would certainly explain why they share many touchstones with our world, while also having two moons for the characters to gaze up at and trees willing to exact revenge. But the true magic in these books for me is in the complexities of the ballroom. Smith has created a complete court to rival Versailles in intrigue, with fan language, complicated symbolism woven covertly into jewelry, long lineage that gives you the feeling every character does have a twisting family tree, and old traditions so tangible you’re sure they must have been in fashion once in our world too.