Francis Blomefield

“ CHAPTER III OF THE CITY UNDER THE DANES AND DANISH MONARCHS.
Thus the Danes settled here, and fortified themselves against all enemies, about 1011; and the next year, Turkil, or Turketel, a Danish Earl, took possession of all Norfolk, having expelled the English Earl Ulfketel, and held it under Swain to his death, which happened in 1014, upon which the Danish army chose Cnute or Canute, his son, for their king; but upon Swain's death, the English took courage, sent for Etheldred out of Normandy, who returned and drove Canute out, and forced him to go to Denmark for recruits ”

“ Canute became sole monarch of all England; and in 1017, assigned all Norfolk to Earl Turkil, who had enjoyed it ever since the expulsion of Earl Ulfketel, "and committed to him the custody of Cnute, which his father Swain burnt and destroyed; and to keep the East-Angles secure to him, he (Canute) was most like to be the builder of the present stone castle of Norwich ”