The iconographic sources vary and include Pierio Valeriano's dictionary of symbols, (1556); popular emblem books such as Andrea Alciati's (1531) and Achille Bocchi's (1555); the divination game (1540) by ; as well as Vincenzo Cartari's mythographic manual for painters (1556).Broderick, 'Custodian of Wisdom...', p. 21 The "Mantegna Tarocchi" were used as iconographic sources for the depictions of the liberal arts and the muses in the staircase.Broderick, 'Ascent to Wisdom...', pp. 98–103, 108 (note 210), 155Ivanoff, 'La libreria marciana...', pp. 30, 32
