During much of the 9th century , because of the Danish incursions , there was no bishop at Elmham ; in addition the see of Dunwich was extinguished .
East Anglia became a single diocese once more .
During much of the 9th century , because of the Danish incursions , there was no bishop at Elmham ; in addition the see of Dunwich was extinguished and East Anglia became a single diocese once more .