Robert Ghillebert or Gilbert, an Englishman, was doctor of theology and was at the time of Jeanne's trial dean of the King of England's chapel.

He became in 1433 Dean of York and he reports in a petition to Eugene IV (November 17, 1435) that in the time when he had followed the King in all the battles won in France he had seen many murders, fires, etc., and that he rejoiced from the depths of his heart when his countrymen were victorious just as he suffered profoundly when they were beaten.

He was still Dean of York when he was confirmed as Bishop of London by Eugene IV on May 21, 1436.