 Under Rufus , he continued to hold the king 's seal , and also became involved in the financial administration of the kingdom , where he quickly made a name for himself by his novel methods of raising revenue . He was given custody of a number of vacant ecclesiastical offices , administering at one point sixteen vacant bishoprics or abbeys . His many duties have led to him being considered the first Chief Justiciar of England . During Rufus ' reign , Ranulf supervised the construction of the first stone bridge in London and oversaw the construction of the king 's hall at Westminster . In 1099 he was rewarded with the bishopric of Durham . 
