As with just about everything to do with the 'Toltecs', whom the Aztecs and other central Mesoamerican cultures of the Postclassic era held up as their valiant precursors whose legacy and authority they inherited, actual and discernible historical data is scant.
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In Aztec legendary tradition Huemac (fl. c. 11th century), also spelled Hueymac or Huehmac, is described as being the last king of the (equally legendary and semi-mythical) Toltec state before the fall of Tula/Tollan.