Having a pre-Norman history spanning 400 years and a re-foundation in 970, Ely over the course of the next hundred years had become one of England's most successful Benedictine abbeys, with a famous saint, treasures, library, book production of the highest order and lands exceeded only by Glastonbury. However the imposition of Norman rule was particularly problematic at Ely. Newly arrived Normans such as Picot of Cambridge were taking possession of abbey lands, there was appropriation of daughter monasteries such as Eynesbury by French monks, and interference by the Bishop of Lincoln was undermining its status. All this was exacerbated when, in 1071, Ely became a focus of English resistance, through such people as Hereward the Wake, culminating in the Siege of Ely, for which the abbey suffered substantial fines.