Плиз помогите срочно ответы на вопросы!!!Даю 15 баллов When did the Romans come to York? When did Viking

Плиз помогите срочно ответы на вопросы!!!Даю 15 баллов When did the Romans come to York? When did Vikings come to York? Why did people build the city walls? Why/When did people build the castle? When did people finish to build the catgedral? When/Why did Edward 3 call his sone the Duke of York? When did York get its first mayor? When/Why did people build the Guidhall? When/Where did people start to make chocolate?