Hee, this is all great! (Though I confess that part of what's great is that since there are a lot of definitions, there are lots of answers!)

It’s a contest between my two favourite medieval Empresses, Adelheid (originally of Burgundy, kinda, sorta) and Theophanu. More about them here.

Go team! :D

Margaret of Austria; her praises sung here, here and here.

Yeah!

Anna Amalia of Saxe-Weimar: for contributing very much to Weimar’s a few decades long existence as the hotbed of German literature. Also for not using the Hohenzollern method of child raising on her own kids despite being a granddaughter of FW, for trying her best to keep her subjects out of Uncle Fritz’ recruitment clutches in the e/7 Years War, and for enjoying her retirement via travelling to Italy, staying there for a few years and (as a Protestan princess, no less) having an affair with a hot Catholic Bishop

Honestly, Anna Amalia might be one of my favorites here. (Although Adelheid and Theophanu are stiff competition, especially their team.) Especially for breaking the Hohenzollern tradition of completely dysfunctional families! Though I'd forgotten the hot Catholic bishop (I know forgetting the gossipy sensational bit is out of character but hey, I was really impressed by her childrearing) which is awesome :D

builder of magnificent Rokoko opera houses and palaces, one part of a co-dependent intense sibling relationship with brother Frederick the Great

<3