"The Duke of Norfolk's archives form one of the largest private collections in the country. Those kept at the Castle include all the family papers and the southern estate papers (Norfolk, Suffolk, Surrey, Sussex and London). The northern estate papers, except title deeds, are on loan-deposit at Sheffield Record Office and Hull University Library. The collections at Arundel comprise documents from the 12th century to the 20th century."
There are many documented connections by the Duke's family with the locale of what is now the RC Diocese of East Anglia and the Diocese of Northampton.