Gargantua and Pantagruel
The number of sibyls so depicted could vary, sometimes they were twelve (See, for example, the Apennine Sibyl), sometimes ten, e.g. for François Rabelais, “How know we but that she may be an eleventh sibyl or a second Cassandra?” "Gargantua and Pantagruel", iii. 16, noted in "Brewer's Dictionary of Phrase and Fable", 1897.