In 959, Berengar and Guy of Ivrea led an expedition against Theobald. They defeated him and captured both Spoleto and Camerino. Duke Theobald was deposed by Emperor Otto I around the year 964 because of his support for the deposed Pope John XII.The Chronicles of Farfa suggest that he was succeeded by Count Transmond of Camerino, but there are no documents attesting to this succession. Instead it seems likely that Theobald was succeeded by Otto's loyal supporter Prince Pandulf I (Pandulf Ironhead).
- Edoardo Manarini, I due volti del potere. Una parentela atipica di ufficiali e signori nel regno italico, Milano, Ledizioni, 2019, online edition on  Academia.edu and  Leedizioni
| Duke of Spoleto
Trasmond III of Camerino
| Margrave of Camerino
Guy of Ivrea