What event is portrayed in the elaborately carved lintel showing the Maya ruler Shield Jaguar and his wife Lady Xoc (4.6.6)?

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The elaborately carved lintel showing the Maya ruler Shield Jaguar and his wife Lady Xoc depicts a bloodletting ritual, a common religious practice in ancient Mesoamerica. The pair are shown piercing their tongues and ears to offer their blood to the gods, a ritual believed to promote agricultural fertility and appease the gods.

What Event Is Portrayed in the Elaborately Carved Lintel Showing