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Explicitly mentioned as a book containing Christmas-themed claims by the character Sir Lee Teabing about Christian icons being derived from pagan traditions

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Explicitly described as 'a book' that Tom was reading in preparation for a court case about the Stonehenge Tunnel, containing claims about the church drawing attention away from pagan feast days

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Described as Ronald Hutton's 'great book' - a history of the ritual year in Britain, cited for its discussion of Christmas and the December 25th date

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Mentioned as a classic example of 19th century scholarship about universal religious themes of death and resurrection, and later referenced regarding Lord of Misrule traditions

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Described as 'a brilliant book on everyday life in the Roman Republic' - quoted regarding the nature of the Saturnalia festival

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Referenced as 'the great poem that is written by Virgil to celebrate the origins of Rome' - quoted regarding Saturn's role in bringing civilization to Rome