One conflict during this monarch's reign was the Battle of Villalar, in which her son's victory ended the Revolt of the Comuneros.
One conflict during this monarch's reign was the Battle of Villalar, in which her son's victory ended the Revolt of the Comuneros. This monarch's husband and father signed a treaty to keep her out of government, though her father reneged the same day that it was signed. After her husband Philip I's death, her country fell into disorder when neither she nor her six-year-old son were perceived fit to rule. After her father's death, her son ascended to the throne as the first monarch of the unified kingdom of Spain; that son was Holy Roman Emperor Charles I. For 10 points, name this second daughter of Ferdinand and Isabella, and first queen regnant of the kingdoms of both Castile and Aragon, who had a history of mental illness.
One conflict during this monarch's reign was the Battle of Villalar, in which her son's victory ended the Revolt of the Comuneros.
Joanna the Mad or Juana la Loca [accept Joanna of Aragon or Joanna of Castile until those kingdoms are mentioned]  KV