"...before Grim could have ever determinedly put the Grim in Grimsby in any spectacular true fashion, that the place had been an important site and base to the Druids, the ancient Britons, and the Romans, and he was convinced that certain topographical signs were still somewhat observable in his lifetime. He was half-inclined to believe a tradition that there had once existed a sacred stone circle and temple upon one of the town's legendary seven hills at a much earlier point in time and that the site of Grimsby had been a special one in the British Isles to them and their ceremonies; he may indeed have been right. Yet on this latter matter, no topographical evidence still appeared to have remained."

http://homepage.ntlworld.com/nigel.portas/sealb.htm