Classic Maya religion held that human blood was owed to the gods as a form of nourishment and tribute, a debt incurred simply by living in a cosmos the gods had shaped and continued to sustain. Rulers bore the heaviest personal share of that debt, and royal bloodletting was performed at points where the ruler's legitimacy most needed visible divine confirmation: accessions, the dedication of new temples and monuments, the marking of calendar-round anniversaries, and preparation for war. The blood itself was collected on strips of bark paper and then burned, the rising smoke understood as the vehicle carrying the offering upward to the gods and ancestors.
The fullest surviving record is a set of carved stone lintels from Yaxchilan showing the royal woman known as Lady Xoc drawing a thorn-studded rope through a wound already opened in her tongue while her husband, the ruler Shield Jaguar, holds a torch above her, and a companion scene showing the ruler performing an equivalent bloodletting from his own body. Presenting the rite as an obligation shared between the royal couple rather than falling on the king alone, the lintels frame bloodletting as a foundational, recurring duty of Maya kingship rather than an occasional or exceptional act.