Context:

Quoted at the opening of the episode as a classic satirical take on English history, specifically the passage about William the Conqueror and the Norman Conquest being 'a good thing'

Context:

Mentioned as an example of novelists who have written about 1066, specifically described as 'a book on this' about the Norman Conquest

Context:

Referenced in discussion about the idea of division between Normans and English, and how this mythology influenced perceptions of class in England

Context:

Mentioned as a book they discussed in a previous episode, described as being about an English boy who becomes a Varangian guard and travels to Constantinople