[1] Its mid-relief carving depicts the ruler of Yaxchilan, Itzamnaaj Bahlam III (also known as Shield Jaguar), and his consort Lady K’abal Xoc, performing a ceremony of bloodletting; the imagery is also accompanied by descriptive captions, and (unusually for a Maya monumental text) a signature by the sculptor, Mo’ Chaak.

Alfred Maudslay had the lintel cut from the ceiling of a side entrance in 1882 and shipped to Great Britain where it remains today in the British Museum of London.

ti-5-EB 15-ma-AK-u-ba-hi ti-CH’AB-li ti-K’AK’-la-ju-lu u-CH’AB-4-WINIKHAB-AJAW ITZ’-BALAM-ma-u-cha-CHAN-nu a-NIK-ki K’UHUL-[PA’]CHAN-AJAW ti ho (?)

holaju’n mak u baah ti ch’abil ti k’ak’al jul u ch’ab chan winikhaab ajaw Itz’[amnaaj] Bahlam u cha’n Aj Nik k’uhul Pa’chan ajaw "On 5 [Eb] 15 Mak, his image at the penance with the flaming spear, his penance, the four-k’atun lord Itzamnaaj Bahlam, captor of Ah Nik and holy lord of Yaxchilan."

The lintels show the elaborate costumes of the king and queen with remarkable detail and an uncharacteristic lack of abstraction.

The jester mask is considered analogous to the glyph for kingship, ajaw, and is named so for the vegetation often depicted coming from the crown of it.

The artist was careful to show such minute details as the strings that are tied to hold on the wrist cuffs worn by both royals, and the pattern woven on Itzamnaaj Bahlam’s beautiful cape.

By pulling the rope studded with obsidian shards through her tongue, she causes blood to drip onto paper strips held in a woven basket to be burned as depicted on Lintel 25.

There are flower tassels on the main part of the head band and a mosaic depiction of Tlaloc sprouting quetzal feathers.

Discovered in association with the female burial attributed to Lady Xoc were 146 prismatic obsidian blades, each with two lateral notches on the edges.