The remarkable, little-known story of two trailblazing women in the Early Middle Ages who wielded immense power, only to be vilified for daring to rule. Brunhild was a foreign princess, raised to be married off for the sake of alliance-building. Her sister-in-law Fredegund started out as a lowly palace slave. And yet, in sixth-century Merovingian France, where women were excluded from noble succession and royal politics was a blood sport, these two iron-willed strategists reigned over vast realms, changing the face of Europe.