Answer
Countess Matilda of Tuscany was the countess whose territories were disputed over by Lucius III and Frederick I. Matilda was a powerful noblewoman who ruled over Tuscany, Emilia, and northern Lazio. She was a supporter of the papacy and a strong opponent of the Holy Roman Emperors. Lucius III and Frederick I were rivals for control of Italy, and Matilda's territories were caught in the middle.