"After the discovery of Stela 35 by Roberto García Moll in 1982, I proposed that because lady Ik Skull was depicted on both sides of the stela letting blood in a ceremony that occurred about a year prior to Shield Jaguar's death, but Shield Jaguar was not named in an u cab statmenent on the stela, as was customary when women did ceremonies while a king was ruler, she may have temporarily had responsibility for ceremonial duties at the site. I cited the existence of a Mah K'ina title, usually reserved for rulers, as evidence that her position was like that of a ruler."
Carolyn E. Tate, Yaxchilan: The Design of a Maya Ceremonial City, p. 124
It is believed that Lady Evening Star [Lady Ik Skull] was a foreigner, possibly from Calakmul. She was the mother of Bird Jaguar.