 In 793 the vulnerability of the English east coast was exposed when the monastery at Lindisfarne was looted by Vikings and a year later Jarrow was also attacked , events which Steven Plunkett reasons would ensure that the East Anglians were governed firmly . Æthelberht 's claim to be a king descended from the Wuffingas dynasty ( suggested by the use of a Roman she @-@ wolf and the title REX on his coins ) could be because of a need for strong kingship as a result of the Viking attacks . 
