Take a guided tour today and let the characters reveal their fascinating stories entrenched in the building’s 1,000 year history. When William the Conqueror invaded England and won the Battle of Hastings in 1066, Oxford Castle was marked by the Normans as the ideal place for a motte-and-bailey castle. Today, after almost one millennia, Oxford Castle Unlocked is a visitor attraction with a past stretching far beyond your imagination.