The first group, the Romans, came in the first century. Some of their great     1     included building towns and roads. The Vikings came in the eighth century, left behind lots of new vocabulary, and also the names of many     2     across the UK. The last group were the Normans. They conquered England after the well-known Battle of Hastings in the 11^th century. They had castles built all around England, and made changes to the     3     system.