In 1056, Herbert escaped from Le Mans, and himself went to the court of William, duke of Normandy. There his sister Marguerite was betrothed to Robert Curthose, but died before the marriage could take place. Herbert paid homage to William for the county of Maine, was to marry, Adelida, a daughter of William, but died in 1062.
- Aird, William M. (2008). Robert 'Curthose', Duke of Normandy (C. 1050-1134). The Boydell Press.
- Barlow, Frank (2000). William Rufus. Yale University Press.
- van Houts, Elisabeth (2019). Married Life in the Middle Ages, 900-1300. Oxford University Press.