Possible Clues:

• Island out of Defoe, possibly originally associated with old bit of Britain
• Area of northern and eastern England under Viking rule
• A land we abandoned that was occupied by invaders
• European starts to look around Windsor, an ancient part of England
• Rules in force in England before the Norman conquest
• Northern part of England when under foreign rule
• Area of England settled by Vikings
• Part of England in the time of Alfred the Great
• As lion-tamer taking a wife, I must leave the old north
• Viking-occupied England