Classic Maya Bloodletting and the Cultural Evolution of Religious Rituals: Quantifying Patterns of Variation in Hieroglyphic Texts
Figure 5
Relative frequency of dated monuments with ch’ahb’ bloodletting glyph in each 20-year k’atun period.
References to bloodletting rituals exceed 15% during two k’atun periods, 9.8.0.0.0 (593–613 CE) and 9.13.0.0.0 (692–712 CE).