Passage: At this time the Emperor Otto I detached from the Duchy of Spoleto the lands called Sabina Langobardica and presented them to the Holy See. Now the control of Spoleto became increasingly a gift of the Emperors. In 967, Otto II briefly united the Duchy of Spoleto with that of Capua and Benevento, which was then ruled by Pandulf Ironhead; but after Pandolfo's death he detached Spoleto, which in 989 he granted to Hugh, Margrave of Tuscany. The duchy was united with Tuscany a second time in 1057 and it remained so until the death of the Countess Matilda.

Question: When was the duchy reunited with Tuscany again?
1057