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Referenced as a primary source for Harold Hardrada's life, described as 'part of the cycle called Heimskringler' written about 200 years after the events. Multiple passages are quoted from this saga throughout the episode.

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Explicitly mentioned as 'the most recent biography of Harold Hardrada' by 'the American writer Don Holway.' The hosts discuss his interpretation of the Constantinople stories.

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Referenced as another Icelandic saga source that contains stories about Harold Hardrada, including the serpent in the dungeon story. Quoted directly regarding the venomous serpent.

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Referenced when discussing the description of Maria Sclerina, with Tom noting that the passage about her charm and musical voice is 'entirely left from Plutarch's life of... Antony' - comparing it to Plutarch's famous description of Cleopatra.