One of the best anime I've ever seen, it's really one of my favorites. The fact that it is an old anime from the 70s may put some off but the story is really good. The characters are touching, the atmosphere really plunges us into the political context of the time (even if the story is clearly revisited), and the romances are not boring as in some shojo. The dialogues give the work a theatrical vibe, which makes everything dramatic. It's truly one of my favorites. I’m really glad I found out by chance.
It's highly recommended that you try Versailles no Bara, it's a true classic.