Answer
Canossa Castle, located in northern Italy, was the stronghold of Matilda of Tuscany, a powerful and influential figure in the 11th and 12th centuries. The castle became famous for the "Walk to Canossa" in 1077, when Emperor Henry IV sought forgiveness from Pope Gregory VII for his defiance of the Church. Matilda's control over Canossa Castle and her strategic alliances made her a formidable force in medieval politics.