 Scott DeGregorio has argued that the Tribal Hidage provides evidence that Anglo-Saxon governments required a system of "detailed assessment" in order to construct great earthworks such as Offa's Dyke.The kingdom of East Anglia is recorded for the first time in the Tribal Hidage.According to Davies and Vierck, 7th century East Anglia may have consisted of a collection of regional groups, some of which retained their individual identity.