According to Francisco Hernández (quoted by Las Casas and Diego López de Cogolludo), Bacab was the son of the creator god, Itzamna, and of the goddess Ixchebelyax; he had once been humbled, killed, and revived.
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The Bacabs played an important role in the cosmological upheaval associated with Katun 11 Ahau, when Oxlahuntiku 'Thirteen-god' was humbled by Bolontiku 'Nine-god'.