I will expand this article when I can. What the author is describing is closer to the East of England region of which East Anglia forms a part. The Anglo Saxon kingdom of East Anglia consisted of Norfolk and Suffolk only. The traditional region consisted of pre 1974 Cambridgeshire, not including Huntingdonshire and Peterborough which were then annexed, and North Essex, particular the area around Colchester. The word anglia is an Old English translation of German Angeln, A small peninsular in German Jutland, that through further translation becomes England and perhaps more importantly in verb form English(language).