Britain’s High Court was plunged into the arcane world of Templars, Merovingians and characters such as Pepin the Fat as lawyers argued Tuesday over the genesis of the mega-selling thriller “The Da Vinci Code.”

A lawyer for the novel’s publisher said ideas about the life and legacy of Jesus Christ that two writers claim were stolen for Dan Brown’s blockbuster are so general that they are not protected by copyright, and that many key themes of their book are not in “The Da Vinci Code.”