[1] Not much is known about either Yoʼnal Ahk III or his successor Haʼ Kʼin Xook, which led Flora Clancy to refer to both their reigns as "shadowy".

[1] It is also known that during his reign, a kʼiniʼ ajaw ("prince") of Piedras Negras, Tʼul Chiik, was captured by Yaxun Bʼalam IV of Yaxchilan; it has been hypothesized that Yoʼnal Ahk III's focus on smaller satellite kingdoms such as La Mar and Yax Niil was a tactic to build up a "base of support" to combat the growing threat that Yaxchilan posed.

The first of these, Stela 14—which Simon Martin and Nikolai Grube called the "finest of all 'niche' monuments"—is the king's accession memorial.

[8] Stela 16 celebrates the accession of a local sajal (or lesser Maya leader) at the nearby satellite kingdom of La Mar.

This stela caused Tatiana Proskouriakoff to misidentify the sixth ajaw of Piedras Negras as this sajal, instead of Haʼ Kʼin Xook.