 A hieroglyphic text is inscribed on the upper surface, relating the founding of the dynasty in AD 426–427.On one side, it shows the dynastic founder K'inich Yax K'uk' Mo' transferring power to Yax Pasaj.Tatiana Proskouriakoff first discovered the inscription on the West Side of Altar Q that tells us the date of the inauguration of Yax Pasaj.