The document provides a historical overview of Britain from pre-Roman times up until the Norman conquest in 1066. It describes the early Celtic settlers, the Roman occupation which lasted for over 400 years, and the subsequent invasion of Anglo-Saxons after the Romans withdrew. It then discusses the Viking invasions from Denmark beginning in the late 9th century, the rule of King Alfred the Great who resisted the Danish expansion, and later Danish rulers like Canute. It concludes with the Norman conquest under William the Conqueror after he defeated the English King Harold at the Battle of Hastings in 1066.