"Lintel 1 commemorates the earliest event in this series, the accession of Bird Jaguar IV to the throne. The mirrors in the uppermost niche of his outfit may refer to the ruler or heir-designate as the "mirror of his people," a Yucatecan phrase found in the Motul Dictionary. He wears the local version of the traditional Maya accession headdress. Bird Jaguar and the mother of his son, Lady Great Skull, both wear the "jester god" on their headdresses, an indication of their divine lineages...He holds the God K manikin scepter and the GIII shield, which is typial Maya accession iconography, but unusual for Yaxchilan before that time."
Carolyn E. Tate, Yaxchilan: The Design of a Maya Ceremonial City, p. 102