Haʼ Kʼin Xook, also known as Ruler 6, was an ajaw of Piedras Negras, an ancient Maya settlement in Guatemala. He ruled during the Late Classic Period, from 767 to 780 AD. Haʼ Kʼin Xook was a son of It
Throne 1 of Piedras Negras, which details the transfer of power from Haʼ Kʼin Xook to his successor Kʼinich Yat Ahk II.