Throughout history the notion of the sinister Grand Vizier has often been invoked when a political leader appears to be developing a cozy relationship with a spiritual advisor of questionable scruples or talents. This stereotype is frequently mentioned in Terry Pratchett's Discworld series, as for example in both Sourcery and Interesting Times. Another instance of a sinister Grand Vizier in entertainment can be found in the science fiction series Lexx, the primary antagonist in the second season being Mantrid, the self-proclaimed "greatest Bio-Vizier of all time."